ci: Drop EOL ruby version

See https://www.ruby-lang.org/en/downloads/branches/

Signed-off-by: Kentaro Hayashi <hayashi@clear-code.com>

Author: kenhys

.github/workflows/linux.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '3.0', '3.1', '3.2', '3.3', '3.4' ]
+        ruby: [ '3.1', '3.2', '3.3', '3.4' ]
         os:
           - ubuntu-latest
     name: Ruby ${{ matrix.ruby }} unit testing on ${{ matrix.os }}

.github/workflows/macos.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '3.0', '3.1', '3.2', '3.3', '3.4' ]
+        ruby: [ '3.1', '3.2', '3.3', '3.4' ]
         os:
           - macOS-latest
     name: Ruby ${{ matrix.ruby }} unit testing on ${{ matrix.os }}

.github/workflows/windows.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '3.0', '3.1', '3.2', '3.3', '3.4' ]
+        ruby: [ '3.1', '3.2', '3.3', '3.4' ]
         os:
           - windows-latest
     name: Ruby ${{ matrix.ruby }} unit testing on ${{ matrix.os }}