force go v1.21

Author: erikng

.github/workflows/build_macadmins_extension.yml

@@ -10,7 +10,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v4
       with:
-        go-version: ${{ env.GO_VERSION }}
+        go-version: '1.21'
 
     - name: Checkout osquery repo repo
       uses: actions/checkout@24cb9080177205b6e8c946b17badbe402adc938f # v3.4.0