Moves the pin to v2.15.0 and enables canonicalheader again, because that
release fixes the random misses behind
#105.
The depguard exemption reached every directory below one ending in test,
and a whole checkout under such a directory. It now covers only the files
directly inside, and the directory a repository is cloned into does not
count. gomodguard_v2 also blocks github.com/go-redis/redis/v9, whose
pre-releases can still be imported.
uniq-by-line is now false, so a line that trips two linters reports both
findings.
Three comments are corrected. A new comment says the file has no
formatters section, so golangci-lint run does not run gofmt.
Model: opus-5-5
sneak