update minimum requirement to PHP 8.2

According to https://stitcher.io/blog/php-version-stats-june-2025 most
people are running a newer version anyway. 8.2 still receives security
support til the en

update minimum requirement to PHP 8.2

According to https://stitcher.io/blog/php-version-stats-june-2025 most
people are running a newer version anyway. 8.2 still receives security
support til the end of the year and is the version included in Debian
old-stable (Bookworm).

This patch only increases the minumum version and updates the composer
dependencies. No code has been changed yet.

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updated composer depedencies

upgrade to phpseclib 3

This replaces the dependabot PR #4114 and adjusts the usage of the
library.