fix PR template testing list numbering (all 1s per markdown standard instead of fragile-er hardcoded numbers)

Author: softwareengineerprogrammer

.github/pull_request_template.md

@@ -6,8 +6,8 @@ and any other relevant information.
 # Testing & Verification
 
 1. Unit tests added: Describe new unit tests added, if any.
-2. Unit tests updated: Describe existing unit tests that were updated, if any.
-3. Manual testing: Describe any additional manual testing steps that were performed, such as running the change on a pre-existing data set you own.
+1. Unit tests updated: Describe existing unit tests that were updated, if any.
+1. Manual testing: Describe any additional manual testing steps that were performed, such as running the change on a pre-existing data set you own.
 
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