fix(cve): remove vulnerable pgproto3/v2 (CVE-2026-32286)

[khrm]

Migrate the two remaining usages of github.com/jackc/pgconn (v1) to github.com/jackc/pgx/v5/pgconn, eliminating the transitive dependency on github.com/jackc/pgproto3/v2 which has an unpatched DoS vulnerability (CVE-2026-32286).

Changes

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Release Notes

NONE

[khrm]

/kind misc

[khrm]

This is also the issue here: https://github.com/tektoncd/results/security/dependabot/78

[Copilot]

Pull request overview

Removes the vulnerable standalone pgproto3/v2 dependency by standardizing PostgreSQL error handling on pgx/v5/pgconn.

Changes:

• Migrates remaining pgconn v1 imports to pgx/v5.
• Removes obsolete dependency metadata and vendored sources.
• Updates PostgreSQL error translation tests.

Reviewed changes

Copilot reviewed 3 out of 85 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
go.mod	Removes obsolete modules.
go.sum	Removes obsolete checksums.
tools/postgres-migrate/main.go	Uses pgx/v5/pgconn.
pkg/api/server/db/errors/postgres/postgres_test.go	Consolidates tests on pgx/v5.
vendor/modules.txt	Removes obsolete vendored modules.
vendor/github.com/jackc/pgproto3/v2/*	Removes vendored pgproto3/v2 package files.
vendor/github.com/jackc/pgio/*	Removes obsolete pgio package files.
vendor/github.com/jackc/pgconn/*	Removes obsolete pgconn v1 package files.
vendor/github.com/jackc/pgconn/internal/ctxwatch/context_watcher.go	Removes pgconn v1 internal helper.
vendor/github.com/jackc/chunkreader/v2/*	Removes obsolete chunkreader package files.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: divyansh42

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[divyansh42]

@khrm can you please change the release notes block to

NONE