Strip trailing spaces [ci skip]

Author: nobu

.github/workflows/test.yml

@@ -19,7 +19,7 @@ jobs:
         include:
           - { os: windows-latest, ruby: ucrt }
           - { os: windows-latest, ruby: mswin }
-          
+
     steps:
       - name: repo checkout
         uses: actions/checkout@v3

CONTRIBUTING.md

@@ -17,7 +17,7 @@ When reporting a bug, please make sure you include:
 * Ruby version (`ruby -v`)
 * `openssl` gem version (`gem list openssl` and `OpenSSL::VERSION`)
 * OpenSSL library version (`OpenSSL::OPENSSL_VERSION`)
-* A sample file that illustrates the problem or link to the repository or 
+* A sample file that illustrates the problem or link to the repository or
   gem that is associated with the bug.
 
 There are a number of unresolved issues and feature requests for openssl that