chore(deps): update github artifact actions (#21)

Ref: PACT-445

Co-authored-by: pactflow-renovate-bot[bot] <186667433+pactflow-renovate-bot[bot]@users.noreply.github.com>

Author: pactflow-renovate-bot[bot]

.github/workflows/sync-dsl.yml

@@ -99,7 +99,7 @@ jobs:
           done
 
       - name: Upload generated files
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7
         with:
           name: dsl-${{ matrix.sdk }}
           path: plugins/swagger-contract-testing/skills/pactflow/references/
@@ -115,7 +115,7 @@ jobs:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd  # v6.0.2
 
       - name: Download generated DSL files
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8
         with:
           pattern: dsl-*
           merge-multiple: true