Upgrade to `actions/cache@v4`. #1189

Job	Run time
macosx-build	1m 59s
mingw-build (--host=x86_64-w64-mingw32)	1m 39s
bazel-build	8s
bigendian	11m 17s
mingw-build (--host=i686-w64-mingw32)	1m 20s
standard-build (--enable-debug --enable-cuckoo --enable-magic --enable-macho --enable-pb-tests --...	2m 24s
standard-build (--enable-debug --enable-profiling --enable-cuckoo --enable-magic --enable-macho -...	2m 32s
	21m 19s

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