chore(deps): update actions/setup-go action to v6 (#735)

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Author: renovate[bot]

.github/workflows/buildtest.yaml

@@ -42,7 +42,7 @@ jobs:
           sudo apt-get install -y libsoxr-dev libopus-dev libopusfile-dev opus-tools
 
       - name: Set up Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version: 1.24.3