chore: replace python-language-server to supported pylsp (#3810)

As mentioned in #3722 palantir's python-language-server is no longer maintained.
The alternative is to use the community-driven https://github.com/python-lsp/python-lsp-server.

doc/ale-supported-languages-and-tools.txt

@@ -411,7 +411,7 @@ Notes:
   * `pyflakes`
   * `pylama`!!
   * `pylint`!!
-  * `pyls`
+  * `pylsp`
   * `pyre`
   * `pyright`
   * `reorder-python-imports`