bug: fixed version incorrectly strips suffix from 0.7b1

[valgur]

Hi @qchateau and thank you for creating this incredibly useful tool.

It looks like the _fix_version() function has an edge case that is not being handled correctly:
a 0.7b1 release gets incorrectly transformed into 0.7.

I unfortunately did not catch that when merging that version into CCI, leading to conan-io/conan-center-index#22071.

I traced the issue down to this regex replacement:

conan-center-bot/ccb/version.py

Line 7 in bc403d9

VERSION_RE = re.compile(r"[0-9]+(\.[0-9]+)+")

conan-center-bot/ccb/version.py

Lines 94 to 96 in bc403d9

	match = VERSION_RE.search(version)
	if match:
	return match.group(0)

I would gladly submit a PR as well, but it's not entirely clear what cases the function is meant to cover. A small test suite would be beneficial here. I suppose I could create one from the large pool of version numbers already being handled by the tool.

[valgur]

Also, I also scanned all existing version-URL pairs in CCI and this was the only instance of this error that turned up, fortunately.