Bump golang.org/x/net from 0.31.0 to 0.33.0

[mattlord]

Description

Addresses: https://github.com/vitessio/vitess/security/dependabot/400

I'm not sure why Dependabot failed to open a PR (N times)... perhaps we have a permission issue or something. Nothing obvious from the logs.

The bug is in the x/net/html package that we don't actually use in Vitess. The only place we use x/net at all is in some unit tests:

❯ git grep "x/net"
... (non code files)
go/vt/vtadmin/grpcserver/server_test.go:        "golang.org/x/net/nettest"
go/vt/vtctl/grpcvtctldserver/testutil/util.go:  "golang.org/x/net/nettest"
go/vt/vttablet/grpctmclient/cached_client_flaky_test.go:        "golang.org/x/net/nettest"

Related Issue(s)

• Fixes: https://github.com/vitessio/vitess/security/dependabot/400

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
• If this change is to be back-ported to previous releases, a justification is included in the PR description
• Tests were added or are not required
• Did the new or modified tests pass consistently locally and on CI?
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.63%. Comparing base (4299951) to head (178c8c7).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #17416      +/-   ##
==========================================
- Coverage   67.65%   67.63%   -0.03%     
==========================================
  Files        1581     1581              
  Lines      253775   253775              
==========================================
- Hits       171694   171631      -63     
- Misses      82081    82144      +63     

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