make php-recode optional

https://packages.debian.org/sid/php7.3-recode https://packages.debian.org/sid/php-recode points to php 7.4

See: https://tracker.debian.org/action-items/1295387 See: https://qa.debian.org/dose/debcheck/src_unstable_main/latest/packages/phpmyadmin.html#1e096dde933ba3646e6cf47a4a8eb249

Any advice @blaimi-guest @fsateler I would use Recommend field for this package

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