Update used version of rand and regex #307

Job	Run time
build_system	20s
build (libgccjit.so, master, --mini-tests)	5m 23s
duplicates	3s
build (libgccjit.so, master, --std-tests)	5m 23s
build (libgccjit.so, master, --test-libcore)	13m 5s
build (libgccjit.so, master, --extended-rand-tests)	8m 19s
build (libgccjit.so, master, --extended-regex-example-tests)	5m 22s
build (libgccjit.so, master, --extended-regex-tests)	7m 55s
build (libgccjit.so, master, --test-successful-rustc --nb-parts 2 --current-part 0)	11m 5s
build (libgccjit.so, master, --test-successful-rustc --nb-parts 2 --current-part 1)	10m 52s
build (libgccjit.so, master, --projects)	9m 2s
build (libgccjit_without_int128.so, master-without-128bit-integers, --mini-tests)	5m 31s
build (libgccjit_without_int128.so, master-without-128bit-integers, --std-tests)	5m 31s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-libcore)	13m 10s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-rand-tests)	8m 6s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-regex-example-tests)	5m 16s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-regex-tests)	8m 29s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-successful-rustc --nb-...	10m 47s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-successful-rustc --nb-...	11m 32s
build (libgccjit_without_int128.so, master-without-128bit-integers, --projects)	9m 7s
	2h 34m 18s

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