chore(deps): update github artifact actions

Author: renovate[bot]

.github/workflows/flare-ui.yml

@@ -134,15 +134,15 @@ jobs:
     runs-on: macos-15
     steps:
       - name: Download artifacts
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: test_output
 
       - name: Merge test results
         run: xcrun xcresulttool merge test_output/**/*.xcresult --output-path test_output/final/final.xcresult
 
       - name: Upload merged test results
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: MergedResult
           path: test_output/final

.github/workflows/flare.yml

@@ -103,15 +103,15 @@ jobs:
     runs-on: macos-15
     steps:
       - name: Download artifacts
-        uses: actions/download-artifact@v7
+        uses: actions/download-artifact@v8
         with:
           path: test_output
 
       - name: Merge test results
         run: xcrun xcresulttool merge test_output/**/*.xcresult --output-path test_output/final/final.xcresult
 
       - name: Upload merged test results
-        uses: actions/upload-artifact@v6
+        uses: actions/upload-artifact@v7
         with:
           name: MergedResult
           path: test_output/final