get go version to install from go.mod

Author: dgrove-oss

.github/workflows/precommit.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Set Go
         uses: actions/setup-go@v5
         with:
-          go-version: v1.20
+          go-version-file: './go.mod'
 
       # Compensate for lack of pre-commit-go-toolchain image
       - name: Set up Python