docker: archlinux: upgrade to gcc13
docker: archlinux: add tests dependencies

cmake: fix maybe-uninit false positives
cmake: rename ENABLE_UNIT_TESTS_PUSH_NOTIFICATION -> ENABLE_UNIT_TESTS_NGHTTP2ASIO

sdk: update to 5.2.85

ci: archlinux: Make the GCC build run always
ci: archlinux: Build tests without NGHTTP2Asio
ci: rocky8: Disable NOSOCI build & tests

nix: use gcc13