Moving to v2 because v1 references repositories that have been
deleted from GitHub, breaking GOPROXY=direct.
The lint config (.golangci.yml) was already in v2 format; this updates
the tool dependency used by 'make lint' to golangci-lint/v2 v2.13.2,
drops the now-obsolete blank import in internal/tooldeps in favor of a
Go 'tool' directive, and bumps the CI workflow binary to match.
Updates #cleanup
Signed-off-by: James Tucker <jftucker@gmail.com>