Update ecosystem test puma dependency version

Author: bjfish

test/truffle/ecosystem/blog5/Gemfile.lock

@@ -80,7 +80,7 @@ GEM
     nokogiri (1.10.5)
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
-    puma (3.12.1)
+    puma (3.12.2)
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)

test/truffle/ecosystem/blog6/Gemfile.lock

@@ -87,7 +87,7 @@ GEM
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     pg (1.1.3)
-    puma (3.12.0)
+    puma (3.12.2)
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)