Bump puma from 4.3.5 to 4.3.8 in /source/scripts/ruby/blog/source

Bumps [puma](https://github.com/puma/puma) from 4.3.5 to 4.3.8.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v4.3.5...v4.3.8)

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

Author: dependabot[bot]

source/scripts/ruby/blog/source/Gemfile.lock

@@ -76,11 +76,11 @@ GEM
     mini_mime (1.0.2)
     mini_portile2 (2.5.0)
     minitest (5.11.3)
-    nio4r (2.5.2)
+    nio4r (2.5.7)
     nokogiri (1.11.1)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
-    puma (4.3.5)
+    puma (4.3.8)
       nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)