Validation of module names by gno mod is weak

Description

gno mod does not appear to apply the same level of strict validation of module names as go mod does.

% cat gno.mod
module �xample.com/myproject

go 1.20
% gno mod tidy
% cat go.mod
module �xample.com/myproject

go 1.20
% go mod tidy
go: malformed module path "�xample.com/myproject": invalid char '�'

Your environment

• Go version (example: go1.22.4): go version go1.23.4 darwin/arm64
• OS and CPU architecture (example: linux/amd64): darwin/arm64
• Gno commit hash causing the issue (example: f24690e): 36c8f0e

Steps to reproduce

• Tell us how to reproduce this issue
  

See above sample modfile

• Where the issue is, if you know
  
• Which commands triggered the issue, if any

See above

Expected behaviour

Tell us what should happen

gno mod should return error similar to go mod

Actual behaviour

Tell us what happens instead

Logs

Please paste any logs here that demonstrate the issue, if they exist

Proposed solution

If you have an idea of how to fix this issue, please write it down here, so we can begin discussing it