fix: Replace EOL ruby 3.1 testing with 3.4 (#30)

Ruby 3.1 went EOL this year

Signed-off-by: Tim Smith <tsmith84@gmail.com>

Author: tas50

.github/workflows/lint-unit.yml

@@ -82,7 +82,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["3.1", "3.2", "3.3"]
+        ruby: ["3.2", "3.3", "3.4"]
     steps:
       - name: Checkout code
         uses: actions/checkout@v4