build(deps): bump puma from 6.4.0 to 6.4.2 in /backend

Bumps [puma](https://github.com/puma/puma) from 6.4.0 to 6.4.2.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v6.4.0...v6.4.2)

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

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

backend/Gemfile

@@ -7,7 +7,7 @@ gem "rails", "~> 7.0.4"
 gem "pg", "~> 1.1"
 gem "pg_search"
 gem "activerecord-postgis-adapter"
-gem "puma", "~> 6.0"
+gem "puma", "~> 6.4"
 gem "redis", "~> 5.0"
 gem "rswag"
 gem "active_storage_validations"

backend/Gemfile.lock

@@ -355,7 +355,7 @@ GEM
       timeout
     net-smtp (0.4.0)
       net-protocol
-    nio4r (2.5.8)
+    nio4r (2.7.0)
     nokogiri (1.15.5)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
@@ -378,7 +378,7 @@ GEM
       activerecord (>= 5.2)
       activesupport (>= 5.2)
     public_suffix (5.0.4)
-    puma (6.4.0)
+    puma (6.4.2)
       nio4r (~> 2.0)
     raabro (1.4.0)
     racc (1.7.3)
@@ -610,7 +610,7 @@ DEPENDENCIES
   pagy
   pg (~> 1.1)
   pg_search
-  puma (~> 6.0)
+  puma (~> 6.4)
   rails (~> 7.0.4)
   ransack
   redis (~> 5.0)