ci: explicitly install pygments and certifi on macos #684

Job	Run time
build (linux-gcc)	10m 11s
build (linux-clang)	9m 20s
build (macos)	9m 47s
build (linux-i686-gcc)	8m 42s
build (android)	55s
build (windows-cygwin-64)	13m 20s
build (windows-cygwin-32)	11m 38s
build (windows-msys2-64)	10m 51s
build (android-recovery, ubuntu-22.04, aarch64-linux-android32)	48s
	1h 15m 32s

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