fix: suppress more "this-escape" warnings from JDK 21

This is a followup to 851ddee and PR #4486. Parser constructor needs a similar pragma.

Signed-off-by: combolek <[email protected]>

tool/resources/org/antlr/v4/tool/templates/codegen/Java/Java.stg

@@ -356,6 +356,7 @@ case <f.ruleIndex>:
 >>
 
 parser_ctor(p) ::= <<
+@SuppressWarnings("this-escape")
 public <p.name>(TokenStream input) {
 	super(input);
 	_interp = new ParserATNSimulator(this,_ATN,_decisionToDFA,_sharedContextCache);