cmd/go: TestScript/mod_invalid_version fails on Windows

[bcmills]

go test proxy running at GOPROXY=http://127.0.0.1:60426/mod
--- FAIL: TestScript (0.01s)
    --- FAIL: TestScript/mod_invalid_version (0.23s)
        script_test.go:252:
            # Regression test for golang.org/issue/27173: if the user (or go.mod file)
            # requests a pseudo-version that does not match both the module path and commit
            # metadata, reject it with a helpful error message.
            #
            # TODO(bcmills): Replace the github.com/pierrec/lz4 examples with something
            # equivalent on vcs-test.golang.org.
            # An incomplete commit hash is not a valid semantic version,
            # but can appear in the main go.mod file anyway and should be resolved. (0.202s)
            > cp go.mod.orig go.mod
            > go mod edit -require golang.org/x/text@14c0d48ead0c
            > cd outside
            $WORK\gopath\src\outside
            > ! go list -m golang.org/x/text
            [stderr]
            go list -m: [email protected] (replaced by ./..): parsing ..\go.mod: $WORK\gopath\src\go.mod:5: require golang.org/x/text: version "14c0d48ead0c" invalid: must be of the form v1.2.3
            [exit status 1]
            > stderr 'go list -m: [email protected] \(replaced by \./\..\): parsing ../go.mod: '$WORK'/gopath/src/go.mod:5: require golang.org/x/text: version "14c0d48ead0c" invalid: must be of the form v1.2.3'
            FAIL: testdata\script\mod_invalid_version.txt:22: no match for `(?m)go list -m: [email protected] \(replaced by \./\..\): parsing ../go.mod: \$WORK/gopath/src/go.mod:5: require golang.org/x/text: version "14c0d48ead0c" invalid: must be of the form v1.2.3` found in stderr

FAIL
FAIL    cmd/go  626.033s

[gopherbot]

Change https://golang.org/cl/326869 mentions this issue: cmd/go: match Windows paths in TestScript/mod_invalid_version