cmd/go: adjust expected error message in TestScript/mod_invalid_version

CL 188817 improved the error message for a nonexistent version in a dependency.
This CL locks in that improvement in a regression test.

Fixes #33474

Change-Id: I6246b4995adee966f24eaebe491d35830aea8370
Reviewed-on: https://go-review.googlesource.com/c/go/+/188977Reviewed-by: Emmanuel Odeke <emm.odeke@gmail.com>

src/cmd/go/testdata/script/mod_invalid_version.txt

@@ -141,7 +141,7 @@ go mod edit -require golang.org/x/text@v1.999999.0
 go mod edit -replace golang.org/x/text@v1.999999.0=golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c
 cd outside
 ! go get -d golang.org/x/text@upgrade
-stderr 'go get golang.org/x/text@upgrade: golang.org/x/text@v1.999999.0: invalid version: unknown revision v1.999999.0'
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v1.999999.0: reading golang.org/x/text/go.mod at revision v1.999999.0: unknown revision v1.999999.0'
 cd ..
 go get -d golang.org/x/text@upgrade
 go list -m golang.org/x/text