Update GitHub actions

Author: tim-dlang

.github/workflows/tests.yml

@@ -26,12 +26,12 @@ jobs:
     runs-on: ${{ matrix.os }}
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v6
       with:
         persist-credentials: false
 
     - name: Install D compiler
-      uses: dlang-community/setup-dlang@v1
+      uses: dlang-community/setup-dlang@v2
       with:
         compiler: ${{ matrix.dc }}