build(deps): bump actions/checkout from 2 to 3

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v3)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/publish.yml

@@ -34,7 +34,7 @@ jobs:
   publish:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           # chartpress requires git history to set chart version and image tags
           # correctly

.github/workflows/test-chart.yaml

@@ -28,7 +28,7 @@ jobs:
   lint_shell_scripts:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions/setup-python@v3
 
       - name: Install dependencies
@@ -40,7 +40,7 @@ jobs:
   lint_and_validate_rendered_templates:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions/setup-python@v3
         with:
           python-version: "3.8"
@@ -73,7 +73,7 @@ jobs:
           - helm-version: v3.5.0 # minimal required version
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions/setup-python@v3
         with:
           python-version: "3.8"
@@ -189,7 +189,7 @@ jobs:
               --set singleuser.storage.type=dynamic
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           # chartpress requires git history to set chart version and image tags
           # correctly

.github/workflows/test-docker-build.yaml

@@ -29,7 +29,7 @@ jobs:
   build_images:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           # chartpress requires git history to set chart version and image tags
           # correctly

.github/workflows/test-docs.yaml

@@ -25,7 +25,7 @@ jobs:
   linkcheck:
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           # chartpress, used by docs/conf.py, requires git history to set
           # chart version and image tags correctly

.github/workflows/vuln-scan.yaml

@@ -43,7 +43,7 @@ jobs:
             accept_failure: false
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           # chartpress requires git history to set chart version and image tags
           # correctly