Fix DB tag regexp in Hibernate GitHub Bot configuration

Java apparently throws exception when the replacement string references
non-matching groups.

This new regexp no longer relies on optional groups,
and thus should work fine.

.github/hibernate-github-bot.yml

@@ -53,7 +53,7 @@ develocity:
         pattern: "s390x"
         replacement: "$1"
       - column: "DB"
-        pattern: "(h2|postgres(?:ql)?|pgsql|mysql|mariadb|mssql|derby|tidb|cockroach(?:db)?|oracle|db2|hsqldb|edb|sybase)(?:(.*)_ci|(.*))"
-        replacement: "$1$2$3"
+        pattern: "((?:h2|postgres(?:ql)?|pgsql|mysql|mariadb|mssql|derby|tidb|cockroach(?:db)?|oracle|db2|hsqldb|edb|sybase)(?:.*(?=_ci)|.*))(?:_ci)?"
+        replacement: "$1"
       - pattern: "main|HEAD|\\d+.\\d+|PR-\\d+"
         replacement: "" # Just remove these tags