Random failing MakeStaticRefactoringTests

https://download.eclipse.org/eclipse/downloads/drops4/I20250105-1800/testresults/html/org.eclipse.jdt.ui.tests.refactoring_ep435I-unit-macosx-x86_64-java21_macosx.cocoa.x86_64_21.html

```
java.lang.IllegalStateException: Missing system library
at org.eclipse.jdt.core.dom.ASTParser.checkForSystemLibrary(ASTParser.java:311)
at org.eclipse.jdt.core.dom.ASTParser.getClasspath(ASTParser.java:272)
at org.eclipse.jdt.core.dom.ASTParser.internalCreateASTCached(ASTParser.java:1299)
at org.eclipse.jdt.core.dom.ASTParser.lambda$1(ASTParser.java:1178)
at org.eclipse.jdt.internal.core.JavaModelManager.cacheZipFiles(JavaModelManager.java:5708)
at org.eclipse.jdt.core.dom.ASTParser.internalCreateAST(ASTParser.java:1178)
at org.eclipse.jdt.core.dom.ASTParser.createAST(ASTParser.java:918)
at org.eclipse.jdt.ui.tests.refactoring.MakeStaticRefactoringTests.matchASTs(MakeStaticRefactoringTests.java:113)
at org.eclipse.jdt.ui.tests.refactoring.MakeStaticRefactoringTests.performRefactoringAndMatchFiles(MakeStaticRefactoringTests.java:83)
at org.eclipse.jdt.ui.tests.refactoring.MakeStaticRefactoringTests.testGenericDeclaration3(MakeStaticRefactoringTests.java:307)
at java.base/java.lang.reflect.Method.invoke(Method.java:580)
```