go.yml: use stable go-version (#162)

Previously we were using the version in go.mod. We're thinking we
shouldn't update that unless we want to use new features of the latest
go release. However, for the build / test actions, it seems important to
test using a version we'd recommend for our clients.

Fix #154

Author: alan-strohm

.github/workflows/go.yml

@@ -22,7 +22,10 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@0aaccfd150d50ccaeb58ebd88d36e91967a5f35b # v5.4.0
       with:
-        go-version-file: 'go.mod'
+        # TODO: enable [matrix testing](https://github.com/marketplace/actions/setup-go-environment#matrix-testing)
+        # so that we can test on both stable, oldstable and the oldest version
+        # we currently support (as specified in go.mod).
+        go-version: 'stable'
 
     - name: Build
       run: go build -v ./...