(chore): use swift-action to get Swift6

Author: N3v1

.github/workflows/documentation.yml

@@ -27,6 +27,11 @@ jobs:
     steps:
       - name: Checkout 🛎️
         uses: actions/checkout@v3
+      - uses: swift-actions/setup-swift@v2
+        with:
+          swift-version: "6.0"
+      - name: Get swift version
+        run: swift --version
       - name: Select Xcode Version ✨
         run: |
           sudo xcode-select -switch /Applications/Xcode_16_beta_6.app