Bump sinatra from 3.0.4 to 4.1.0 in /building-a-web-application

Bumps [sinatra](https://github.com/sinatra/sinatra) from 3.0.4 to 4.1.0.
- [Changelog](https://github.com/sinatra/sinatra/blob/main/CHANGELOG.md)
- [Commits](sinatra/sinatra@v3.0.4...v4.1.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

building-a-web-application/Gemfile.lock

@@ -51,9 +51,10 @@ GEM
     postgresql_cursor (0.6.9)
       activerecord (>= 6.0)
     racc (1.8.1)
-    rack (3.1.7)
-    rack-protection (4.0.0)
+    rack (3.1.8)
+    rack-protection (4.1.0)
       base64 (>= 0.1.0)
+      logger (>= 1.6.0)
       rack (>= 3.0.0, < 4)
     rack-session (2.0.0)
       rack (>= 3.0.0)
@@ -88,17 +89,18 @@ GEM
       postgresql_cursor (~> 0.6)
       thread_safe (~> 0.3.6)
       tzinfo (>= 1.1)
-    sinatra (4.0.0)
+    sinatra (4.1.0)
+      logger (>= 1.6.0)
       mustermann (~> 3.0)
       rack (>= 3.0.0, < 4)
-      rack-protection (= 4.0.0)
+      rack-protection (= 4.1.0)
       rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
-    sinatra-contrib (4.0.0)
+    sinatra-contrib (4.1.0)
       multi_json (>= 0.0.2)
       mustermann (~> 3.0)
-      rack-protection (= 4.0.0)
-      sinatra (= 4.0.0)
+      rack-protection (= 4.1.0)
+      sinatra (= 4.1.0)
       tilt (~> 2.0)
     sinatra-flash (0.3.0)
       sinatra (>= 1.0.0)