build: regenerate DEPS.bzl and BUILD.bazel for forked modules

Run gazelle update-repos + mirror so the Bazel build graph matches go.mod:

- DEPS.bzl now resolves github.com/tikv/client-go/v2 and github.com/tikv/pd/*
  to the forked module revisions (matching the go.mod replace directives)
  instead of the previous internal revisions, which are not fetchable from a
  public Bazel build (caused "invalid version: unknown revision" in CI).
- BUILD.bazel: register tikv_config_updater.go and refresh affected
  shard_count values to keep gazelle output consistent.

Author: ClamChowderTiDB