ci: upgrade and pin actions/upload-artifact to v7.0.1 (#745)

* ci: upgrade and pin actions/upload-artifact to v7.0.1

Upgrades all three upload-artifact usages from @v4 / unpinned @v7 to a
SHA-pinned @v7.0.1 (Node.js 24) to eliminate GitHub's deprecated Node.js 20
runner warnings and ensure supply-chain integrity.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

* ci: upgrade and pin actions/download-artifact to v7.0.0

Upgrades download-artifact from @v4 to SHA-pinned @v7.0.0 to match the
upload-artifact v7 upgrade and eliminate Node.js 20 deprecation warnings.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: nickolas-dimitrakas

.github/workflows/cross-platform-tests.yml

@@ -40,7 +40,7 @@ jobs:
         run: ./gradlew runIos
       - name: Archive Test Results
         if: always()
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: ios-test-results
           path: Users/runner/Library/Developer/Xcode/DerivedData

.github/workflows/integration-tests.yml

@@ -99,7 +99,7 @@ jobs:
 
       - name: Upload artifacts on failure
         if: failure()
-        uses: actions/upload-artifact@v7
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: integration-test-artifacts
           path: ${{ env.WORKING_DIRECTORY }}/artifacts/

.github/workflows/release-publish.yml

@@ -200,7 +200,7 @@ jobs:
           rm -rf archives
 
       - name: Upload xcframework artifacts
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
         with:
           name: xcframework-${{ matrix.kit.name }}
           path: xcframeworks/*.xcframework.zip
@@ -224,7 +224,7 @@ jobs:
           persist-credentials: false
 
       - name: Download xcframework artifacts
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
         with:
           name: xcframework-${{ matrix.kit.name }}