Restore go module toolchain version

We set the Go module toolchain version to an earlier version to allow
running `go mod tidy` from older versions. However, this has the side
effect of making the Go toolchain emulate older Go versions. This breaks
some standard library tests which expect current toolchain behavior. To
fix this, restore Go module toolchain version after tidy.

.github/workflows/test-ubi-centos.yml

@@ -120,6 +120,8 @@ jobs:
           # lower the go build version to 1.16
           sed -i "s/go mod tidy/go mod tidy -go=1.16/g" scripts/create-secondary-patch.sh
           ./scripts/full-initialize-repo.sh
+          # raise the go module version back to what is expected to prevent the toolchain from emulating older versions.
+          go mod edit -go="$(./go/bin/go version | awk '{ print $3 }' | sed 's/go//' | awk -F. '{printf "%s.%s\n", $1, $2}')" ./go/src/go.mod
 
       - name: "Configure FIPS tests"
         shell: bash