Fix user-agent parsing of security releases

[derSascha]

What this PR does / why we need it:

The user-agent parser fails on the recently released 11.2.2+security-01 grafana version string. My logs contains many entries like this:

logger=base.plugin.context t=2024-10-20T18:07:40.005997558 level=warn msg="Could not create user agent" error="invalid user agent format"

Which issue(s) this PR fixes:

https://github.com/grafana/grafana/issues/95006

Special notes for your reviewer:

The version 11.2.2+security-01 seems to be a valid semver string.

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