Use python.typing.org for typing documentation links (#17323)

## Summary

There is a new official URL for the typing documentation:
https://typing.python.org/

Change all https://typing.readthedocs.io/ links to use the new sub
domain, which is slightly shorter and looks more official.

## Test Plan

Tested to see if each and every new URL is accessible. I noticed that
some links go to https://typing.python.org/en/latest/source/stubs.html
which seems to be outdated, but that is a separate issue. The same page
shows up for the old URL.

crates/red_knot_python_semantic/src/suppression.rs

@@ -535,7 +535,7 @@ impl<'a> SuppressionsBuilder<'a> {
         // > imports, or other executable code, silences all errors in the file.
         // > Blank lines and other comments, such as shebang lines and coding cookies,
         // > may precede the # type: ignore comment.
-        // > https://typing.readthedocs.io/en/latest/spec/directives.html#type-ignore-comments
+        // > https://typing.python.org/en/latest/spec/directives.html#type-ignore-comments
         let is_file_suppression = comment.kind.is_type_ignore() && !self.seen_non_trivia_token;
 
         let suppressed_range = if is_file_suppression {