CI: Replace explicit versions for actions with only major

Where possible. This will hopefully reduce dependabot churn (assuming it
supports this--unclear), and also compensates for the fact that
dependabot is not issuing updates for actions versions within our own
composite actions.

.github/actions/install-conda/action.yml

@@ -11,7 +11,7 @@ runs:
   using: composite
   steps:
     - name: Setup conda caching
-      uses: actions/cache@v2.1.6
+      uses: actions/cache@v2
       with:
         path: ~/conda_pkgs_dir
         key: conda-${{ inputs.type }}-${{ runner.os }}-${{ inputs.python-version}}-${{ hashFiles('ci/*') }}
@@ -21,7 +21,7 @@ runs:
           conda-${{ inputs.type }}-
 
     - name: Set up Python ${{ inputs.python-version }}
-      uses: conda-incubator/setup-miniconda@v2.1.1
+      uses: conda-incubator/setup-miniconda@v2
       with:
         miniforge-version: latest
         miniforge-variant: mambaforge

.github/actions/install-pypi/action.yml

@@ -20,7 +20,7 @@ runs:
   using: composite
   steps:
     - name: Set up Python ${{ inputs.python-version }}
-      uses: actions/setup-python@v2.2.2
+      uses: actions/setup-python@v2
       with:
         python-version: ${{ inputs.python-version }}
         cache: 'pip'

.github/actions/run-tests/action.yml

@@ -50,6 +50,6 @@ runs:
 
     - name: Upload coverage
       if: ${{ always() && inputs.upload-coverage == 'true' }}
-      uses: codecov/codecov-action@v2.1.0
+      uses: codecov/codecov-action@v2
       with:
         name: ${{ inputs.key }}

.github/actions/setup-proj/action.yml

@@ -13,7 +13,7 @@ runs:
   using: composite
   steps:
     - name: Set up caching
-      uses: actions/cache@v2.1.6
+      uses: actions/cache@v2
       id: cache-proj
       with:
         path: ~/${{ inputs.install-path }}

.github/workflows/code-analysis.yml

@@ -24,7 +24,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v2
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v1

.github/workflows/docs-conda.yml

@@ -27,7 +27,7 @@ jobs:
     steps:
     # We check out only a limited depth and then pull tags to save time
     - name: Checkout source
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v2
       with:
         fetch-depth: 100
 

.github/workflows/docs.yml

@@ -38,7 +38,7 @@ jobs:
     steps:
     # We check out only a limited depth and then pull tags to save time
     - name: Checkout source
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v2
       with:
         fetch-depth: 100
 
@@ -85,7 +85,7 @@ jobs:
       run: echo "DOC_VERSION=v${{ needs.Docs.outputs.doc-version }}" >> $GITHUB_ENV
 
     - name: Upload to GitHub Pages
-      uses: peaceiris/actions-gh-pages@v3.8.0
+      uses: peaceiris/actions-gh-pages@v3
       with:
         deploy_key: ${{ secrets.GHPAGES_DEPLOY_KEY }}
         publish_dir: ./docs/build/html

.github/workflows/linting.yml

@@ -9,10 +9,10 @@ jobs:
     name: Flake8
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2.4.0
+      - uses: actions/checkout@v2
 
       - name: Set up Python 3
-        uses: actions/setup-python@v2.3.0
+        uses: actions/setup-python@v2
         with:
           python-version: 3.x
           cache: 'pip'

.github/workflows/nightly-builds.yml

@@ -21,7 +21,7 @@ jobs:
     steps:
     # We check out only a limited depth and then pull tags to save time
     - name: Checkout source
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v2
       with:
         fetch-depth: 100
 
@@ -70,7 +70,7 @@ jobs:
     steps:
     # We check out only a limited depth and then pull tags to save time
     - name: Checkout source
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v2
       with:
         fetch-depth: 100
 

.github/workflows/release.yml

@@ -13,15 +13,15 @@ jobs:
       url: https://pypi.org/project/MetPy/
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2.4.0
+    - uses: actions/checkout@v2
       with:
         fetch-depth: 10
 
     - name: Get tags
       run: git fetch --depth=1 origin +refs/tags/*:refs/tags/*
 
     - name: Set up Python
-      uses: actions/setup-python@v2.3.0
+      uses: actions/setup-python@v2
       with:
         python-version: 3.x
 

.github/workflows/tests-conda.yml

@@ -26,7 +26,7 @@ jobs:
     steps:
     # We check out only a limited depth and then pull tags to save time
     - name: Checkout source
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v2
       with:
         fetch-depth: 100
 

.github/workflows/tests-pypi.yml

@@ -31,7 +31,7 @@ jobs:
     steps:
     # We check out only a limited depth and then pull tags to save time
     - name: Checkout source
-      uses: actions/checkout@v2.4.0
+      uses: actions/checkout@v2
       with:
         fetch-depth: 100