chore: bump golangci-lint version, ignore _gen.go files
chore: bump golangci-lint version, ignore _gen.go files

1.19 has issues on the GolangCI service[1], which is fixed by upgrading.

[1]: https://golangci.com/r/github.com/loadimpact/k6/pulls/1143

loadimpact/k6,loadimpact/k6