Fix GHA build status badges in Readme #366

Job	Run time
ubuntu-focal (g++-9)	20m 10s
macos (clang)	11m 11s
posix-cmake-install (ubuntu-20.04)	1m 25s
posix-cmake-subdir (ubuntu-20.04)	1m 1s
ubuntu-focal (clang++-10)	18m 4s
posix-cmake-install (ubuntu-22.04)	1m 29s
posix-cmake-subdir (ubuntu-22.04)	1m 7s
posix-cmake-install (ubuntu-24.04)	1m 24s
windows_msvc_14_2 (msvc-14.2)	23m 38s
posix-cmake-subdir (ubuntu-24.04)	1m 0s
windows_msvc_14_3 (msvc-14.3)	24m 24s
posix-cmake-install (macos-13)	3m 4s
posix-cmake-subdir (macos-13)	2m 22s
posix-cmake-install (macos-14)	1m 31s
windows-cmake-install (windows-2019)	3m 45s
posix-cmake-subdir (macos-14)	1m 25s
windows-cmake-subdir (windows-2019)	4m 5s
posix-cmake-install (macos-15)	1m 48s
windows-cmake-install (windows-2022)	4m 26s
windows-cmake-subdir (windows-2022)	3m 18s
posix-cmake-subdir (macos-15)	1m 42s
	2h 12m 19s

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