Added 8.6 job

Author: ezimuel

.ci/jobs/elastic+elasticsearch-php+8.4.yml renamed to .ci/jobs/elastic+elasticsearch-php+8.6.yml

@@ -1,12 +1,12 @@
 ---
 - job:
     name: elastic+elasticsearch-php+8.4
-    display-name: 'elastic / elasticsearch-php # 8.4'
-    description: Testing the elasticsearch-php 8.4 branch.
+    display-name: 'elastic / elasticsearch-php # 8.6'
+    description: Testing the elasticsearch-php 8.6 branch.
     parameters:
     - string:
         name: branch_specifier
-        default: refs/heads/8.4
+        default: refs/heads/8.6
         description: the Git branch specifier to build (<branchName>, <tagName>,
           <commitId>, etc.)
     triggers: