Update used version of rand and regex #308

Job	Run time
build_system	20s
build (libgccjit.so, master, --mini-tests)	5m 23s
build (libgccjit.so, master, --std-tests)	5m 39s
build (libgccjit.so, master, --test-libcore)	12m 50s
duplicates	3s
build (libgccjit.so, master, --extended-rand-tests)	8m 51s
build (libgccjit.so, master, --extended-regex-example-tests)	5m 37s
build (libgccjit.so, master, --extended-regex-tests)	8m 3s
build (libgccjit.so, master, --test-successful-rustc --nb-parts 2 --current-part 0)	10m 58s
build (libgccjit.so, master, --test-successful-rustc --nb-parts 2 --current-part 1)	10m 48s
build (libgccjit.so, master, --projects)	9m 2s
build (libgccjit_without_int128.so, master-without-128bit-integers, --mini-tests)	5m 38s
build (libgccjit_without_int128.so, master-without-128bit-integers, --std-tests)	5m 28s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-libcore)	12m 56s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-rand-tests)	8m 27s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-regex-example-tests)	5m 23s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-regex-tests)	8m 54s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-successful-rustc --nb-...	14m 4s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-successful-rustc --nb-...	11m 29s
build (libgccjit_without_int128.so, master-without-128bit-integers, --projects)	9m 29s
	2h 39m 22s

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