chore: Add author mikewrighton to .mergify.yml. (aws#26845)

Add author mikewrighton to .mergify.yml.

Co-authored-by: Mike Wrighton <mikewr@amazon.com>
Co-authored-by: Kaizen Conroy <36202692+kaizencc@users.noreply.github.com>
Co-authored-by: Colin Francis <131073567+colifran@users.noreply.github.com>

.mergify.yml

@@ -11,7 +11,7 @@ pull_request_rules:
       label:
         add: [ contribution/core ]
     conditions:
-      - author~=^(rix0rrr|MrArnoldPalmer|iliapolo|otaviomacedo|madeline-k|kaizencc|comcalvi|corymhall|peterwoodworth|TheRealAmazonKendra|vinayak-kukreja|mrgrain|pahud|cgarvis|kellertk|HBobertz|sumupitchayan|SankyRed|udaypant|colifran|scanlonp)$
+      - author~=^(rix0rrr|MrArnoldPalmer|iliapolo|otaviomacedo|madeline-k|kaizencc|comcalvi|corymhall|peterwoodworth|TheRealAmazonKendra|vinayak-kukreja|mrgrain|pahud|cgarvis|kellertk|HBobertz|sumupitchayan|SankyRed|udaypant|colifran|scanlonp|mikewrighton)$
       - -label~="contribution/core"
   - name: automatic merge
     actions: