Replace StringBuffer with StringBuilder in AntScript

StringBuffer is synchronized and thus slower than StringBuilder.
The local variable in getEscaped() is not shared across threads,
so StringBuilder is the appropriate choice here.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: laeubi

build/org.eclipse.pde.build/src/org/eclipse/pde/internal/build/ant/AntScript.java

@@ -1095,14 +1095,14 @@ public void printTaskDef(String name, String classname) {
 	}
 
 	public static String getEscaped(String s) {
-		StringBuffer result = new StringBuffer(s.length() + 10);
+		StringBuilder result = new StringBuilder(s.length() + 10);
 		for (int i = 0; i < s.length(); ++i) {
 			appendEscapedChar(result, s.charAt(i));
 		}
 		return result.toString();
 	}
 
-	private static void appendEscapedChar(StringBuffer buffer, char c) {
+	private static void appendEscapedChar(StringBuilder buffer, char c) {
 		buffer.append(getReplacement(c));
 	}