Use asyncio.timeout instead of asyncio.wait_for

[farmio]

Description

Use asyncio.timeout instead of asyncio.wait_for with a backport-version for python 3.9 and 3.10
See python/cpython#98518

I'm not aware of wait_for having ever caused bugs in xknx, but I won't be waiting for it either 😉
As an extra, timeout dosen't spawn extra tasks and the context manager syntax is nicer 🚀

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Code quality improvements to existing code or addition of tests

Checklist

• The documentation has been adjusted accordingly
• Tests have been added that prove the fix is effective or that the feature works
• The changes are documented in the changelog (docs/changelog.md)

[codecov]

Codecov Report

Merging #1246 (df7db57) into main (728e953) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1246   +/-   ##
=======================================
  Coverage   96.50%   96.50%           
=======================================
  Files         149      150    +1     
  Lines        9491     9512   +21     
=======================================
+ Hits         9159     9180   +21     
  Misses        332      332           

Impacted Files	Coverage Δ
xknx/cemi/cemi_handler.py	98.70% <100.00%> (+0.03%)	⬆️
xknx/core/value_reader.py	100.00% <100.00%> (ø)
xknx/io/gateway_scanner.py	97.93% <100.00%> (+0.02%)	⬆️
xknx/io/ip_secure.py	95.42% <100.00%> (+0.02%)	⬆️
xknx/io/request_response/request_response.py	100.00% <100.00%> (ø)
xknx/io/self_description.py	83.33% <100.00%> (+0.40%)	⬆️
xknx/management/management.py	88.48% <100.00%> (+0.28%)	⬆️
xknx/util/__init__.py	100.00% <100.00%> (ø)