Update GitHub Actions dependencies (#78)

* Update GitHub Actions dependencies

* Add dependabot

Author: mortenpi

.github/dependabot.yaml

@@ -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: "/"
+    schedule:
+      interval: "weekly"

.github/workflows/CI.yml

@@ -54,21 +54,12 @@ jobs:
       # - name: sshd logs
       #   run: |
       #     journalctl -t sshd
-      - uses: actions/checkout@v2
-      - uses: julia-actions/setup-julia@v1
+      - uses: actions/checkout@v5
+      - uses: julia-actions/setup-julia@v2
         with:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
-      - uses: actions/cache@v1
-        env:
-          cache-name: cache-artifacts
-        with:
-          path: ~/.julia/artifacts
-          key: ${{ runner.os }}-test-${{ env.cache-name }}-${{ hashFiles('**/Project.toml') }}
-          restore-keys: |
-            ${{ runner.os }}-test-${{ env.cache-name }}-
-            ${{ runner.os }}-test-
-            ${{ runner.os }}-
+      - uses: julia-actions/julia-runtest@v1
       - uses: julia-actions/julia-buildpkg@v1
       - uses: julia-actions/julia-runtest@v1
         env:
@@ -77,10 +68,10 @@ jobs:
     name: Documentation
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
-      - uses: julia-actions/setup-julia@latest
+      - uses: actions/checkout@v5
+      - uses: julia-actions/setup-julia@v2
         with:
-          version: '1.6'
+          version: '1'
       - run: julia --project=docs -e '
           using Pkg;
           Pkg.instantiate();'