Regenerate GitHub Actions workflow

Executed command: sbt githubWorkflowGenerate

Author: scala-steward

.github/workflows/ci.yml

@@ -96,7 +96,7 @@ jobs:
 
       - name: Upload target directories
         if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v') || github.ref == 'refs/heads/main')
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: target-${{ matrix.os }}-${{ matrix.java }}-${{ matrix.scala }}
           path: targets.tar
@@ -133,7 +133,7 @@ jobs:
         run: sbt +update
 
       - name: Download target directories (2.12)
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           name: target-${{ matrix.os }}-${{ matrix.java }}-2.12
 
@@ -143,7 +143,7 @@ jobs:
           rm targets.tar
 
       - name: Download target directories (2.13)
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           name: target-${{ matrix.os }}-${{ matrix.java }}-2.13
 
@@ -153,7 +153,7 @@ jobs:
           rm targets.tar
 
       - name: Download target directories (3)
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           name: target-${{ matrix.os }}-${{ matrix.java }}-3