add 7.4-rc2 to github action test suite

Author: sjpotter

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         node-version: ['18', '20']
-        redis-version: ['5', '6.0', '6.2', '7.0', '7.2']
+        redis-version: ['5', '6.0', '6.2', '7.0', '7.2', '7.4-rc2']
     steps:
       - uses: actions/checkout@v4
         with: