Bump sinatra from 2.0.7 to 2.0.8 (#11590)

Bumps [sinatra](https://github.com/sinatra/sinatra) from 2.0.7 to 2.0.8.
- [Release notes](https://github.com/sinatra/sinatra/releases)
- [Changelog](https://github.com/sinatra/sinatra/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sinatra/sinatra/compare/v2.0.7...v2.0.8)

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

Co-authored-by: null <27856297+dependabot-preview[bot]@users.noreply.github.com>

Gemfile

@@ -18,7 +18,7 @@ group :jekyll_plugins do
   gem 'jekyll-commonmark', '1.3.1'
 end
 
-gem 'sinatra', '2.0.7'
+gem 'sinatra', '2.0.8'
 gem 'nokogiri', '1.10.7'
 
 # Windows and JRuby does not include zoneinfo files, so bundle the tzinfo-data gem

Gemfile.lock

@@ -70,7 +70,8 @@ GEM
     mercenary (0.3.6)
     mini_portile2 (2.4.0)
     multi_json (1.14.1)
-    mustermann (1.0.3)
+    mustermann (1.1.0)
+      ruby2_keywords (~> 0.0.1)
     nokogiri (1.10.7)
       mini_portile2 (~> 2.4.0)
     nokogiri (1.10.7-x64-mingw32)
@@ -79,7 +80,7 @@ GEM
       forwardable-extended (~> 2.6)
     public_suffix (4.0.1)
     rack (2.0.8)
-    rack-protection (2.0.7)
+    rack-protection (2.0.8)
       rack
     rake (13.0.1)
     rb-fsevent (0.10.3)
@@ -88,6 +89,7 @@ GEM
     rouge (3.13.0)
     ruby-enum (0.7.2)
       i18n
+    ruby2_keywords (0.0.1)
     safe_yaml (1.0.5)
     sass (3.4.25)
     sass-globbing (1.1.5)
@@ -96,10 +98,10 @@ GEM
       ffi (~> 1.9)
     sassc (2.2.1-x64-mingw32)
       ffi (~> 1.9)
-    sinatra (2.0.7)
+    sinatra (2.0.8)
       mustermann (~> 1.0)
       rack (~> 2.0)
-      rack-protection (= 2.0.7)
+      rack-protection (= 2.0.8)
       tilt (~> 2.0)
     stringex (2.8.5)
     terminal-table (1.8.0)
@@ -126,7 +128,7 @@ DEPENDENCIES
   nokogiri (= 1.10.7)
   rake (= 13.0.1)
   sass-globbing (= 1.1.5)
-  sinatra (= 2.0.7)
+  sinatra (= 2.0.8)
   stringex (= 2.8.5)
   tzinfo (~> 2.0)
   tzinfo-data