Replace ffi-backed HTTP client

.github/workflows/main.yml

@@ -14,12 +14,11 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - 2.6
-          - 2.7
-          - 3.0
+          - "3.3"
+          - "3.4"
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with: