[ci] fix cache purging after updating the "latest" files

[ci] upload binaries to R2 as well, purge cache after updating the "latest" files

[cmake] Update to gc 7.6.26 (#322)

[cmake] Update mariadb connector to 3.4.8 (#321)

support semaphores (#318)

support condition variables (#317)

[ci] Fix line escape in powershell script

Fix pthread undefined behaviour in thread_create (#308)

[cmake] Fix empty elseif conditions

[ci] Run mac universal build before deploying

[ci] Require mbedtls@3 in Brewfile

[ci] bump macOS runners. (#313)

[ci] Add universal binaries to build.haxe.org

Fix CI. (#311)

Fix neko version in workflow file