patch 9.0.1685: silence Python 3.11 depreciations for gcc

patch 9.0.1685: silence Python 3.11 depreciations for gcc

Problem: Python 3.11 interface throws deprecation warnings
Solution: ignore those warnings for gcc and clang

Python 3.11 deprecation warnings are already silenced for clang using
the pragma
```
 # pragma clang diagnostic ignored "-Wdeprecated-declarations"
```

However those warnings are also emitted when using gcc. To avoid them
for both compilers, change use the __GNUC__ ifdef, which is defined for
gcc as well as clang.

Additionally, instead of using the "clang diagnostic ignored" pragma,
let's make use of 'GCC diagnostic ignored' which is again supported by
clang and GCC

closes: #12610

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Philip H <47042125+pheiduck@users.noreply.github.com>