chore: drop unused libmcrypt-dev from Dockerfile templates (#2473)

* chore: drop libmcrypt-dev from Alpine Dockerfile template

Removed 'libmcrypt-dev' from the list of dependencies.

Was deprecated in PHP 7.1.0 and removed in PHP 7.2.0.
Has not been used by Nextcloud for awhile.
And we're not installing mcrypt as a PECL installation so it's not used at all.


Signed-off-by: Josh <josh.t.richards@gmail.com>

* chore: drop libmcrypt-dev from Debian Dockerfile template

Removed libmcrypt-dev from the list of dependencies.

Signed-off-by: Josh <josh.t.richards@gmail.com>

---------

Signed-off-by: Josh <josh.t.richards@gmail.com>

Dockerfile-alpine.template

@@ -31,7 +31,6 @@ RUN set -ex; \
         imagemagick-dev \
         libevent-dev \
         libjpeg-turbo-dev \
-        libmcrypt-dev \
         libmemcached-dev \
         libpng-dev \
         libwebp-dev \

Dockerfile-debian.template

@@ -35,7 +35,6 @@ RUN set -ex; \
         libjpeg-dev \
         libldap2-dev \
         libmagickwand-dev \
-        libmcrypt-dev \
         libmemcached-dev \
         libpng-dev \
         libpq-dev \