chore(deps): update github artifact actions to v6

Author: renovate[bot]

.github/workflows/ci-pipeline.yml

@@ -464,7 +464,7 @@ jobs:
           exit ${PIPESTATUS[0]}
 
       - name: Upload coverage artifact
-        uses: actions/upload-artifact@ea165f2524e81b1a7f1f18e1bdb77f0840c18dd9 # v4
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         with:
           name: backend-coverage
           path: backend/coverage.txt
@@ -500,7 +500,7 @@ jobs:
           exit ${PIPESTATUS[0]}
 
       - name: Upload coverage artifact
-        uses: actions/upload-artifact@ea165f2524e81b1a7f1f18e1bdb77f0840c18dd9 # v4
+        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6
         with:
           name: frontend-coverage
           path: frontend/coverage
@@ -546,19 +546,19 @@ jobs:
         uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Download backend coverage artifact
-        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4
+        uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v6
         with:
           name: backend-coverage
           path: backend/
 
       - name: Download frontend coverage artifact
-        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4
+        uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v6
         with:
           name: frontend-coverage
           path: frontend/coverage
 
       - name: Download E2E coverage artifact
-        uses: actions/download-artifact@fa0a91b85d4f404e444e00e005971372dc801d16 # v4
+        uses: actions/download-artifact@018cc2cf5baa6db3ef3c5f8a56943fffe632ef53 # v6
         with:
           name: e2e-coverage
           path: coverage/e2e