Also use uint8_t golden values in randen_test.cc

Also use uint8_t golden values in randen_test.cc

Forwarded: yes
Origin: upstream, https://github.com/abseil/abseil-cpp/commit/cc413f8b674d61e3aa948386432e526e051afca0

Also use uint8_t golden values in randen_test.cc

This makes randen_test, randen_slow_test, and randen_hwaes_test essentially
identical, as is the intent.

The author works at Google. Upstream applied this patch as Piper
revision 405484423 and exported it to GitHub; the Applied-Upstream URL
above points to the exported commit.

Gbp-Pq: Name big-endian-random3.diff