feat: Add support for Rocky Linux 8.9

This commit adds support for the latest version of Rocky Linux (8.9) in the GitLab CI configuration file. It also includes updates to the before_script and script sections to install necessary dependencies and perform required actions for both Rocky Linux versions. Additionally, it introduces new functions sendcrypt_add_checksums_to_tar() and sendcrypt_compress_to_gzip() in the compression.sh file to add checksums to tar archives and compress files using gzip, respectively.