Use mpi-extensions main Open MPI in CI #5080

Job	Run time
ci-scope	6s
pre-commit / link-check	17s
pre-commit / pre-commit	2m 41s
windows / msvc-build (Release)	2m 9s
ubuntu / clang-build (ubuntu-26.04)	3m 39s
windows / msvc-build (Debug)	3m 57s
mac / clang-build (Release)	3m 17s
windows / clang-build	2m 52s
ubuntu / gcc-build (ubuntu-26.04, Release)	2m 55s
ubuntu / gcc-build (ubuntu-26.04, Debug)	2m 15s
mac / clang-build (Debug)	3m 32s
windows / clang-test	2m 5s
ubuntu / gcc-test (ubuntu-26.04)	2m 40s
mac / clang-test	2m 23s
ubuntu / clang-test (ubuntu-26.04)	2m 39s
ubuntu / clang-sanitizer-build (ubuntu-26.04)	3m 52s
windows / msvc-test	1m 51s
windows / clang-test-extended	1m 43s
ubuntu / gcc-test-extended (ubuntu-26.04)	2m 15s
windows / msvc-test-extended	1m 43s
mac / clang-test-extended	1m 58s
ubuntu / clang-test-extended (ubuntu-26.04)	2m 1s
ubuntu / clang-sanitizer-test (ubuntu-26.04)	1m 42s
ubuntu / gcc-build-codecov	4m 4s
ubuntu / clang-sanitizer-test-extended (ubuntu-26.04)	1m 7s
perf / ubuntu-gcc-build-perf-stats	1m 22s
perf / macos-clang-build-perf-stats	2m 14s
pages / build-doxygen-xml	14s
pages / build-scoreboard	22s
pages / build-sphinx	59s
pages / deploy-pages	0s
	1h 4m 54s

Provide feedback