docker test images are not updated in four years

[e-kwsm]

python/.github/workflows/test-ubuntu.yml

Lines 20 to 23 in 2b6f667

	- cxx: clang++
	docker-img: teeks99/boost-python-test:clang-12_1.76.0
	- cxx: g++
	docker-img: teeks99/boost-python-test:gcc-10_1.76.0

The docker images are based on Ubuntu 20.04, whose standard support is ended, and Boost is 1.76.0 as shown by the tags.

[stefanseefeld]

@teeks99, can you confirm what the most recent versions of docker images are ?

[teeks99]

Yikes! Those are old!!!

I can build new ones pretty quickly, is there a compiler you'd like? clang-21 and gcc-15?

[e-kwsm]

Thank you for your quick action.