Create dependabot.yml and update actions (#292)

* Create dependabot.yml

From https://discourse.julialang.org/t/psa-use-dependabot-to-update-github-actions-automatically/96001

* Update dependent GitHub Action versions

* Give CompatHelper.yml steps names and use `shell:`

Author: abhro

.github/dependabot.yml

@@ -0,0 +1,7 @@
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/" # Location of package manifests
+    schedule:
+      interval: "monthly"

.github/workflows/CI.yml

@@ -16,14 +16,14 @@ jobs:
         os: [ubuntu-latest, macOS-latest]
 
     steps:
-      - uses: actions/checkout@v2
-      - uses: julia-actions/setup-julia@latest
+      - uses: actions/checkout@v5
+      - uses: julia-actions/setup-julia@2
         with:
           version: ${{ matrix.julia-version }}
       - uses: julia-actions/julia-buildpkg@latest
       - uses: julia-actions/julia-runtest@latest
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v1
+      - uses: codecov/codecov-action@v5
         if: ${{ matrix.julia-version == '1' && matrix.os == 'ubuntu-latest' }}
         with:
-          file: lcov.info
+          files: lcov.info

.github/workflows/CompatHelper.yml

@@ -7,9 +7,11 @@ jobs:
   CompatHelper:
     runs-on: ubuntu-latest
     steps:
-      - name: Pkg.add("CompatHelper")
-        run: julia -e 'using Pkg; Pkg.add("CompatHelper")'
-      - name: CompatHelper.main()
+      - name: Install CompatHelper
+        shell: julia --color=yes {0}
+        run: using Pkg; Pkg.add("CompatHelper")
+      - name: Run CompatHelper
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: julia -e 'using CompatHelper; CompatHelper.main()'
+        shell: julia --color=yes {0}
+        run: using CompatHelper; CompatHelper.main()