factor semver to separate function

ql/lib/codeql/actions/security/UseOfUnversionedImmutableAction.qll

@@ -6,6 +6,11 @@ class UnversionedImmutableAction extends UsesStep {
   UnversionedImmutableAction() {
     immutableActionsDataModel(immutable_action) and
     this.getCallee() = immutable_action and
-    not this.getVersion().regexpMatch("^(v)?[0-9]+(\\.[0-9]+)*(\\.[xX])?$")
+    isNotSemVer(this.getVersion())
   }
 }
+
+bindingset[version]
+predicate isNotSemVer(string version) {
+  not version.regexpMatch("^(v)?[0-9]+(\\.[0-9]+)*(\\.[xX])?$")
+}