Fix Go version to match go.mod (1.24) instead of stable

Co-authored-by: dlevy-msft-sql <[email protected]>

Author: Copilot

.github/workflows/pr-validation.yml

@@ -13,7 +13,7 @@ jobs:
     - name: Setup go
       uses: actions/setup-go@v5
       with:
-        go-version: stable
+        go-version: '1.24'
     - name: Run tests against Linux SQL
       run: |
         go version