python3-labgrid: Upgrade 25.0.1 -> 26.0

[leon-anavi]

Upgrade labgrid from 25.0.1 to 26.0 with the following modifications:

• Use PyPI source to ensure the same code is built whether labgrid is installed via this layer or pip on desktop Linux distributions like Debian, Ubuntu, etc.
• Drop the import of exceptiongroup because Yocto release Wrynose provides provides and uses a newer Python version in which as per PEP 654 ExceptionGroup is a builtin.

[leon-anavi]

I see taht there is one failing check but according to the logs it is about python3-aiohttp from meta-openembedded therefore it should be directly related to my patch for upgrading labgrid in meta-labgrid to version 26:

ERROR: python3-aiohttp-3.13.5-r0 do_package_qa: QA Issue: File /usr/lib/python3.14/site-packages/aiohttp/.hash/hdrs.py.hash in package python3-aiohttp contains reference to the build host HOME directory [buildpaths]
ERROR: python3-aiohttp-3.13.5-r0 do_package_qa: Fatal QA errors were found, failing task.
ERROR: Logfile of failure stored in: /home/runner/runner/_work/meta-labgrid/meta-labgrid/build/tmp/work/x86-64-v3-oe-linux/python3-aiohttp/3.13.5/temp/log.do_package_qa.413151
NOTE: recipe python3-aiohttp-3.13.5-r0: task do_package_qa: Failed
NOTE: recipe python3-aiohttp-json-rpc-0.13.3-r0: task do_create_package_spdx: Started
ERROR: Task (/home/runner/runner/_work/meta-labgrid/meta-labgrid/meta-openembedded/meta-python/recipes-devtools/python/python3-aiohttp_3.13.5.bb:do_package_qa) failed with exit code '1'