fix(scanner): guard short package tokens in parseApkVersion

[arpitjain099]

parseApkVersion splits each apk version line's package token on - and takes tt[:len(tt)-2] as the name. If the token has fewer than two - separators, len(tt)-2 is negative and the slice panics (slice bounds out of range), which aborts the whole scan.

The two siblings in the same file already guard this: parseApkInstalledList and parseApkUpgradableList both continue on len(...) < 3. parseApkVersion was missing the equivalent check.

Repro: an apk version line whose name has fewer than two hyphens, e.g.

busybox < 1.36.1-r0

(the header line is skipped by the existing strings.Contains(line, "<") guard, so only a malformed data line reaches the split.) Before the fix this panics at strings.Join(tt[:len(tt)-2], ...).

This adds the same len(tt) < 3 guard the siblings use. go test ./scanner/ passes.