gomod: consolidate dependency bumps from open PRs

[sravotto]

Summary

Consolidates open go.mod dependency bump PRs into a single change.

Modules bumped

Module	From	To
github.com/cockroachdb/errors	v1.12.0	v1.13.0
github.com/cockroachdb/crlfmt	v0.3.0	v0.4.0
github.com/getsentry/sentry-go (indirect)	v0.27.0	v0.46.0
Go directive	1.25.8	1.26.2

Other changes

• Updated Dockerfile from golang:1.25 to golang:1.26

Consolidated PRs

• gomod: bump github.com/cockroachdb/crlfmt from 0.3.0 to 0.4.0 #261 - gomod: bump github.com/cockroachdb/crlfmt from 0.3.0 to 0.4.0
• gomod: bump github.com/cockroachdb/errors from 1.12.0 to 1.13.0 #264 - gomod: bump github.com/cockroachdb/errors from 1.12.0 to 1.13.0

Excluded PRs

• Add an example for Follower Reads #217 - Add an example for Follower Reads (not a go.mod PR)