Update phpmyadmin-panel.yaml

Extractor added to retrieve version. 
Test

nuclei -t nuclei-templates/exposed-panels/phpmyadmin-panel.yaml -u https://mojavedata.gov

exposed-panels/phpmyadmin-panel.yaml

@@ -24,3 +24,10 @@ requests:
       - type: word
         words:
           - "<title>phpMyAdmin</title>"
+    extractors:
+      - type: regex
+        part: body
+        group: 1
+        regex:
+          - 'v=([a-z0-9-._]+)'
+