Bump proforma from v0.4 to v0.5

Bumps [proforma](https://github.com/openHPI/proforma) from v0.4 to v0.5.
- [Release notes](https://github.com/openHPI/proforma/releases)
- [Commits](b09c9fcc1f...b9e8769e79)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Gemfile

@@ -33,7 +33,7 @@ gem 'webpacker'
 gem 'rest-client'
 gem 'rubyzip'
 gem 'faraday'
-gem 'proforma', git: 'https://github.com/openHPI/proforma.git', tag: 'v0.4'
+gem 'proforma', git: 'https://github.com/openHPI/proforma.git', tag: 'v0.5'
 gem 'whenever', require: false
 gem 'rails-timeago'
 

Gemfile.lock

@@ -9,14 +9,14 @@ GIT
 
 GIT
   remote: https://github.com/openHPI/proforma.git
-  revision: b09c9fcc1fdb314fc1fb1396e7d0bb2d70e376c5
-  tag: v0.4
+  revision: b9e8769e797f501e19bbfc00ed38946efe6ecf82
+  tag: v0.5
   specs:
-    proforma (0.4)
+    proforma (0.5)
       activemodel (>= 5.2.3, < 6.1.0)
       activesupport (>= 5.2.3, < 6.1.0)
       nokogiri (~> 1.10.2)
-      rubyzip (>= 1.2.2, < 2.1.0)
+      rubyzip (>= 1.2.2, < 2.4.0)
 
 GEM
   remote: https://rubygems.org/