bundle update cool.io

Fix the use of deprecated C API ruby/ruby#15447

Author: k0kubun

benchmarks/fluentd/Gemfile.lock

@@ -25,7 +25,7 @@ GEM
       fiber-annotation
       fiber-local (~> 1.1)
       json
-    cool.io (1.9.0)
+    cool.io (1.9.1)
     csv (3.3.5)
     drb (2.2.3)
     fiber-annotation (0.2.0)
@@ -100,7 +100,7 @@ CHECKSUMS
   base64 (0.3.0) sha256=27337aeabad6ffae05c265c450490628ef3ebd4b67be58257393227588f5a97b
   concurrent-ruby (1.3.5) sha256=813b3e37aca6df2a21a3b9f1d497f8cbab24a2b94cab325bffe65ee0f6cbebc6
   console (1.33.0) sha256=a1cc1910e3b24169b4925e42d72da414d53e5bd6773aee9a811e57dfe0399384
-  cool.io (1.9.0) sha256=ea2aa20059b800cbd8e63f3af975aa87871ca5af79d2da231cf55afd4dcc8332
+  cool.io (1.9.1) sha256=2001bfec1b87ad5e87c0eb9f197a6ee6f1a0433ddba04002227da6ee8b74c6c1
   csv (3.3.5) sha256=6e5134ac3383ef728b7f02725d9872934f523cb40b961479f69cf3afa6c8e73f
   drb (2.2.3) sha256=0b00d6fdb50995fe4a45dea13663493c841112e4068656854646f418fda13373
   fiber-annotation (0.2.0) sha256=7abfadf1d119f508867d4103bf231c0354d019cc39a5738945dec2edadaf6c03