Stop managing mime support package on Debian

All apache2 packages on Debian 10 and later already have a hard dependency on
the `mime-support` package. While `mime-support` still exists on Debian 12
as a transitonal package, upcoming Debian 13 has removed it entirely.

This sets the `$mime_support_package` to undefined so that the package
isn't managed on Debian, since it doesn't need to be.

manifests/mod/mime.pp

@@ -13,9 +13,9 @@
 # @see https://httpd.apache.org/docs/current/mod/mod_mime.html for additional documentation.
 #
 class apache::mod::mime (
-  String $mime_support_package          = $apache::params::mime_support_package,
-  String $mime_types_config             = $apache::params::mime_types_config,
-  Optional[Hash] $mime_types_additional = undef,
+  Optional[String] $mime_support_package = $apache::params::mime_support_package,
+  String $mime_types_config              = $apache::params::mime_types_config,
+  Optional[Hash] $mime_types_additional  = undef,
 ) inherits apache::params {
   include apache
   $_mime_types_additional = pick($mime_types_additional, $apache::mime_types_additional)

manifests/params.pp

@@ -470,8 +470,8 @@
     $keepalive              = 'On'
     $keepalive_timeout      = 15
     $max_keepalive_requests = 100
-    $mime_support_package = 'mime-support'
     $mime_types_config    = '/etc/mime.types'
+    $mime_support_package = undef
     $docroot              = '/var/www/html'
     $cas_cookie_path      = '/var/cache/apache2/mod_auth_cas/'
     $mellon_lock_file     = undef