Change access level (public -> private) of context (DefaultJavaPrettyPrinter.java)

[zielint0]

Change access level from public to private in
src/main/java/spoon/reflect/visitor/DefaultJavaPrettyPrinter.java

        /**
	 * The printing context.
	 *
	 * @deprecated since Spoon 7.1.0, please use {{@link #getContext()}}
	 */
	@Deprecated
	public PrintingContext context = new PrintingContext();

(to access a context, one uses getContext())

The purpose of this issue is to remember of changing access of context.
Related PR: refactor: fix SonarQube - make field 'private', use accessor #2387

[surli]

I let the issue open for now, but FYI before releasing Spoon we always check the deprecated annotation to fix them if it's deprecated since more than one release.
So it will be necessarily done during this process.

[zielint0]

@surli
Thank you for explanation. I was not sure about release process so created this issue.

[pvojtechovsky]

The DJPP#context is now private. Issue was solved by #2649