ExApps should not require AA-VERSION header (#336)

Reason: AppAPI are already a bundled app, that distributes with
Nextcloud Server and always have a version that Nextcloud Server have
and this header is not needed anymore.


Starting from **Nextcloud 32** AppAPI will stop sending this header to
the ExApps.

We do not drop sending `AA-VERSION` header to the NC, until we drop the
support of NC31, as old AppAPI versions still require those header, we
just removing this header from the required header list.

Signed-off-by: bigcat88 <bigcat88@icloud.com>

Author: bigcat88

nc_py_api/_session.py

@@ -478,7 +478,6 @@ def __init__(self, **kwargs):
 
     def sign_check(self, request: HTTPConnection) -> str:
         headers = {
-            "AA-VERSION": request.headers.get("AA-VERSION", ""),
             "EX-APP-ID": request.headers.get("EX-APP-ID", ""),
             "EX-APP-VERSION": request.headers.get("EX-APP-VERSION", ""),
             "AUTHORIZATION-APP-API": request.headers.get("AUTHORIZATION-APP-API", ""),