chore(release): 8.4.0 [skip ci]

# [8.4.0](https://gitlab.ics.muni.cz/perun-proxy-aai/simplesamlphp/simplesamlphp-module-proxystatistics/compare/v8.3.0...v8.4.0) (2023-12-28)

### Features

*  Cron enable/disable flag ([0df119c2](https://gitlab.ics.muni.cz/perun-proxy-aai/simplesamlphp/simplesamlphp-module-proxystatistics/commit/0df119c2c62512ab54f8de88dd816b781ae4a0f4))