Bump proforma from v0.7.1 to v0.8

Bumps [proforma](https://github.com/openHPI/proforma) from v0.7.1 to v0.8.
- [Release notes](https://github.com/openHPI/proforma/releases)
- [Commits](cf61517a5c...d8bf59938f)

---
updated-dependencies:
- dependency-name: proforma
  dependency-type: direct:production
...

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

Gemfile

@@ -30,7 +30,7 @@ gem 'net-smtp', require: false
 gem 'nokogiri'
 gem 'pagedown-bootstrap-rails'
 gem 'pg'
-gem 'proforma', github: 'openHPI/proforma', tag: 'v0.7.1'
+gem 'proforma', github: 'openHPI/proforma', tag: 'v0.8'
 gem 'prometheus_exporter'
 gem 'puma'
 gem 'pundit'

Gemfile.lock

@@ -1,9 +1,9 @@
 GIT
   remote: https://github.com/openHPI/proforma.git
-  revision: cf61517a5cd765afb9d0d19ea1c692e18e3131d7
-  tag: v0.7.1
+  revision: d8bf59938f7605e7e01f0650b67b0ca564e7907b
+  tag: v0.8
   specs:
-    proforma (0.7.1)
+    proforma (0.8.0)
       activemodel (>= 5.2.3, < 8.0.0)
       activesupport (>= 5.2.3, < 8.0.0)
       nokogiri (>= 1.10.2, < 2.0.0)