Bump sinatra from 3.0.6 to 3.1.0 in /assets/dora

Bumps [sinatra](https://github.com/sinatra/sinatra) from 3.0.6 to 3.1.0.
- [Changelog](https://github.com/sinatra/sinatra/blob/main/CHANGELOG.md)
- [Commits](sinatra/sinatra@v3.0.6...v3.1.0)

---
updated-dependencies:
- dependency-name: sinatra
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

assets/dora/Gemfile.lock

@@ -5,9 +5,9 @@ GEM
     json (2.6.3)
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.6.4)
-    rack-protection (3.0.6)
-      rack
+    rack (2.2.8)
+    rack-protection (3.1.0)
+      rack (~> 2.2, >= 2.2.4)
     rack-test (2.1.0)
       rack (>= 1.3)
     rspec (3.12.0)
@@ -24,12 +24,12 @@ GEM
       rspec-support (~> 3.12.0)
     rspec-support (3.12.0)
     ruby2_keywords (0.0.5)
-    sinatra (3.0.6)
+    sinatra (3.1.0)
       mustermann (~> 3.0)
       rack (~> 2.2, >= 2.2.4)
-      rack-protection (= 3.0.6)
+      rack-protection (= 3.1.0)
       tilt (~> 2.0)
-    tilt (2.1.0)
+    tilt (2.2.0)
     webrick (1.8.1)
 
 PLATFORMS