[a11y] Extend Accessibility.ATK-APIs histogram

This CL extends expiry for Accessibility.ATK-APIs histogram.

Bug: 1138235
Change-Id: I2c0f575ec7d484479c2b70696762aef25078c686
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2483947Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Julie Kim <jkim@igalia.com>
Cr-Commit-Position: refs/heads/master@{#819678}

tools/metrics/histograms/histograms_xml/accessibility/histograms.xml

@@ -101,7 +101,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Accessibility.ATK-APIs" enum="AccessibilityATKAPIEnum"
-    expires_after="M88">
+    expires_after="M95">
   <owner>dmazzoni@chromium.org</owner>
   <owner>jkim@igalia.com</owner>
   <owner>chrome-a11y-core@google.com</owner>