7903798: apidiff: Fix .jcheck/conf setting for tags

Reviewed-by: iris

Author: jonathan-gibbons

.jcheck/conf

@@ -7,7 +7,7 @@ jbs=CODETOOLS
 error=author,committer,reviewers,merge,issues,executable,symlink,message,whitespace
 
 [repository]
-tags=apidiff(?:4\.1-b[0-9]{2}|5\.[01]-b[0-9]{2}|6|-[6789](?:\.[0-9]+)*\+[0-9]+)
+tags=(?:apidiff-(?:[1-9]([0-9]*)(?:\.(?:0|[1-9][0-9]*)){0,4})(?:\+(?:(?:[0-9]+))|(?:-ga)))
 branches=
 
 [census]