Bump sinatra from 2.2.0 to 4.1.0 in /src/emailservice

Bumps [sinatra](https://github.com/sinatra/sinatra) from 2.2.0 to 4.1.0.
- [Changelog](https://github.com/sinatra/sinatra/blob/main/CHANGELOG.md)
- [Commits](sinatra/sinatra@v2.2.0...v4.1.0)

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

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

Author: dependabot[bot]

src/emailservice/Gemfile

@@ -3,7 +3,7 @@ source "https://rubygems.org"
 gem "net-smtp", "~> 0.3"
 gem "pony",     "~> 1.13"
 gem "puma",     "~> 5.6"
-gem "sinatra",  "~> 2.2"
+gem "sinatra",  "~> 4.1"
 
 gem "opentelemetry-sdk",                     "~> 1.1"
 gem "opentelemetry-exporter-otlp",           "~> 0.21"

src/emailservice/Gemfile.lock

@@ -1,14 +1,16 @@
 GEM
   remote: https://rubygems.org/
   specs:
+    base64 (0.2.0)
     digest (3.1.0)
     google-protobuf (3.21.1)
     googleapis-common-protos-types (1.3.1)
       google-protobuf (~> 3.14)
+    logger (1.6.1)
     mail (2.7.1)
       mini_mime (>= 0.1.1)
     mini_mime (1.1.2)
-    mustermann (1.1.1)
+    mustermann (3.0.3)
       ruby2_keywords (~> 0.0.1)
     net-protocol (0.1.3)
       timeout
@@ -46,20 +48,27 @@ GEM
       mail (>= 2.0)
     puma (5.6.4)
       nio4r (~> 2.0)
-    rack (2.2.3.1)
-    rack-protection (2.2.0)
-      rack
+    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)
     ruby2_keywords (0.0.5)
-    sinatra (2.2.0)
-      mustermann (~> 1.0)
-      rack (~> 2.2)
-      rack-protection (= 2.2.0)
+    sinatra (4.1.0)
+      logger (>= 1.6.0)
+      mustermann (~> 3.0)
+      rack (>= 3.0.0, < 4)
+      rack-protection (= 4.1.0)
+      rack-session (>= 2.0.0, < 3)
       tilt (~> 2.0)
-    tilt (2.0.10)
+    tilt (2.4.0)
     timeout (0.3.0)
 
 PLATFORMS
   arm64-darwin-21
+  x86_64-linux
 
 DEPENDENCIES
   net-smtp (~> 0.3)
@@ -68,7 +77,7 @@ DEPENDENCIES
   opentelemetry-sdk (~> 1.1)
   pony (~> 1.13)
   puma (~> 5.6)
-  sinatra (~> 2.2)
+  sinatra (~> 4.1)
 
 BUNDLED WITH
    2.3.7