Drop unused patch file

debian/patches/0760-bump-rubyzip.patch

@@ -1,16 +0,0 @@
-Description: This patch bumps rubyzip to 2.0.
-Author: Utkarsh Gupta <guptautkarsh2102@gmail.com>
-Bug-Debian: https://bugs.debian.org/944906
-Last-Update: 2019-11-19
-
---- a/Gemfile
-+++ b/Gemfile
-@@ -61,7 +61,7 @@
- 
- # GitLab Pages
- gem 'validates_hostname', '~> 1.0', '>= 1.0.6'
--gem 'rubyzip', '~> 1.3', require: 'zip'
-+gem 'rubyzip', '~> 2.0', require: 'zip'
- # GitLab Pages letsencrypt support
- gem 'acme-client', '~> 2.0', '>= 2.0.2'
-