treewide: Fix mysql alias deprecation breakage

62733b37b4 broke evaluation in all
places `pkgs.mysql` was used. Fix this by changing all occurrences to
`pkgs.mariadb`.

(cherry picked from commit 59e0120aa5c1241d48048afa615e25c65d7e366d)

pkgs/development/lua-modules/overrides.nix

@@ -173,7 +173,7 @@ with super;
       MYSQL_LIBDIR="${pkgs.libmysqlclient}/lib/mysql";
     };
     buildInputs = [
-      pkgs.mysql.client
+      pkgs.mariadb.client
       pkgs.libmysqlclient
     ];
   });