Regenerate GitHub Actions workflow

Executed command: sbt githubWorkflowGenerate

Author: scala-steward

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -69,7 +69,7 @@ jobs:
         run: tar cf targets.tar scex-macros/target scex-core/target scex-test/target scex-util/target target project/target
 
       - name: Upload target directories
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: target-${{ matrix.os }}-${{ matrix.scala }}-${{ matrix.java }}
           path: targets.tar
@@ -86,7 +86,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
 
@@ -118,7 +118,7 @@ jobs:
         uses: sbt/setup-sbt@v1
 
       - name: Download target directories (2.13.18)
-        uses: actions/download-artifact@v5
+        uses: actions/download-artifact@v6
         with:
           name: target-${{ matrix.os }}-2.13.18-${{ matrix.java }}