Update actions/setup-go action to v6

Author: renovate[bot]

.github/workflows/testing.yml

@@ -38,7 +38,7 @@ jobs:
           disable-telemetry: true
 
       - name: Set up Go ${{ matrix.go }}
-        uses: actions/setup-go@4d34df0c2316fe8122ab82dc22947d607c0c91f9 # v4.0.0
+        uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6.0.0
         with:
           go-version: ${{ matrix.go }}