internal/e2e: run go mod tidy
https://cuelang.org/cl/1171747 made changes to the root go.mod file,
which also leads to changes in internal/e2e/go.mod due to the replace.
This made the end-to-end test step in CI fail on master,
which we never noticed given that the step doesn't run on CLs.
The next CL will make CI a bit more robust against this.
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Change-Id: I9528e05345f8d7d8cceabb9e30b55fc19a77d958
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1171768
Reviewed-by: Roger Peppe <rogpeppe@gmail.com>
TryBot-Result: CUEcueckoo <cueckoo@cuelang.org>