problem installing on go 1.22

seems fussy about launchpad.net, which is unfortunately still being imported by tests,

```

 ... imports

	github.com/tysonmote/gommap tested by

	github.com/tysonmote/gommap.test imports

	launchpad.net/gocheck: unrecognized import path "launchpad.net/gocheck": GOVCS disallows using bzr for public launchpad.net/gocheck; see 'go help vcs'
```