Removed 6.1 from test suite due to isseus with zip file

Github workflow failing as we could not download the zip. Numerous re-tries through out the day.

Author: colinmurphy

.github/workflows/unit-test-plugin.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-22.04
     strategy:
       matrix:
-        wordpress: [ '6.7', '6.6', '6.5', '6.4', '6.3', '6.2', '6.1' ]
+        wordpress: [ '6.7', '6.6', '6.5', '6.4', '6.3', '6.2']
     steps:
       - name: Checkout
         uses: actions/checkout@v4