Ignore 'v' prefix when searching for versions

It's optional anyway, so this should make zero difference to what the
regular expression finds. However, with the 'v' there, it's going to be
part of the match when it founds. This won't parse correctly then, using
`semver::Version::parse`, as a 'v' prefix is not a valid part of a
version.

tools/release-operator/src/release.rs

@@ -43,7 +43,7 @@ impl Release {
         let commit: String = cmd_lib::run_fun!(git log -n 1 "${sha}")?;
 
         // A release commits need to contain a semver version number.
-        let version = Regex::new(r"(v?\d+.\d+.\d+)")?
+        let version = Regex::new(r"(\d+.\d+.\d+)")?
             .find_iter(&commit)
             .inspect(|version| {
                 log::info!(