Updated CI job to 8.8

Author: ezimuel

.ci/jobs/elastic+elasticsearch-php+8.6.yml renamed to .ci/jobs/elastic+elasticsearch-php+8.8.yml

@@ -1,14 +1,14 @@
 ---
 - job:
-    name: elastic+elasticsearch-php+8.4
-    display-name: 'elastic / elasticsearch-php # 8.6'
-    description: Testing the elasticsearch-php 8.6 branch.
+    name: elastic+elasticsearch-php+8.8
+    display-name: 'elastic / elasticsearch-php # 8.8'
+    description: Testing the elasticsearch-php 8.8 branch.
     parameters:
     - string:
         name: branch_specifier
-        default: refs/heads/8.6
+        default: refs/heads/8.8
         description: the Git branch specifier to build (<branchName>, <tagName>,
           <commitId>, etc.)
     triggers:
     - github
-    - timed: 'H */12 * * *'
+    - timed: 'H */12 * * *'