add dependabot config, update actions

Author: m-fila

.github/dependabot.yml

@@ -0,0 +1,12 @@
+# To get started with Dependabot version updates, you'll need to specify which
+# package ecosystems to update and where the package manifests are located.
+# Please see the documentation for all configuration options:
+# https://docs.github.com/github/administering-a-repository/configuration-options-for-dependency-updates
+
+version: 2
+updates:
+  # Keep dependencies for GitHub Actions up-to-date
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'weekly'

.github/workflows/ci.yml

@@ -22,10 +22,10 @@ jobs:
           - x64
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
 
     - name: Setup Julia environment
-      uses: julia-actions/setup-julia@v1
+      uses: julia-actions/setup-julia@v2
       with:
         version: ${{ matrix.version }}
         arch: ${{ matrix.arch }}
@@ -212,7 +212,7 @@ jobs:
     
     - name: Upload test results
       if: always()
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v5
       with:
         name: test-results-${{ matrix.os }}-${{ matrix.version }}
         path: |