ci.yml: Upgrade Actions, tweak Julia version matrix, add cache

ARM on macOS is disabled until the next engine update (currently getting infamous "illegal instruction: 4" on CI, but not locally)

.github/workflows/ci.yml

@@ -2,6 +2,10 @@ name: CI
 
 on: [push, pull_request]
 
+permissions:
+  actions: write
+  contents: read
+
 jobs:
   test:
     name: Test
@@ -11,32 +15,34 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        julia-version: ['1.6', '1'] #  'nightly']
-        julia-arch: [x64, x86]
-        os: [ubuntu-latest, windows-latest, macOS-latest]
-        exclude:
-          - os: macOS-latest
-            julia-arch: x86
+        julia-version: ['1.6', '1.10', '1'] #  'nightly']
+        os: [ubuntu-latest, windows-latest, macos-13] #, macOS-latest
+        # exclude:
+        #   - os: macOS-latest
+        #     julia-version: 1.6
     steps:
-      - uses: actions/checkout@v3
-      - uses: julia-actions/setup-julia@v1
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.julia-version }}
+      - uses: julia-actions/cache@v2
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v1
+      - uses: codecov/codecov-action@v4
         with:
           file: lcov.info
+          fail_ci_if_error: false
 
   docs:
     name: Documentation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
-      - uses: julia-actions/setup-julia@v1
+      - uses: actions/checkout@v4
+      - uses: julia-actions/setup-julia@v2
         with:
           version: '1'
+      - uses: julia-actions/cache@v2
       - uses: julia-actions/julia-buildpkg@v1
       - run: |
           julia --project=docs -e '