Bump expire date for two metrics

The following metrics will now expired in M95
Enterprise.PolicyUpdatePeriod.MachineLevelUser
Signin.AuthenticatedLaunchUserEvent

Bug: 1138274, 1138327
Change-Id: I60f548c3bb0d16df3e06761469b1a7ae23050003
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2476954
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Owen Min <zmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817598}

tools/metrics/histograms/histograms_xml/enterprise/histograms.xml

@@ -1066,7 +1066,7 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 </histogram>
 
 <histogram name="Enterprise.PolicyUpdatePeriod.MachineLevelUser" units="days"
-    expires_after="M88">
+    expires_after="M95">
   <owner>zmin@chromium.org</owner>
   <owner>pastarmovj@chromium.org</owner>
   <summary>Time since last machine level user policy fetch.</summary>

tools/metrics/histograms/histograms_xml/signin/histograms.xml

@@ -162,7 +162,7 @@ prefs when the profile is loaded.  -->
 </histogram>
 
 <histogram name="Signin.AuthenticatedLaunchUserEvent"
-    enum="AuthenticatedLaunchUserEvent" expires_after="M88">
+    enum="AuthenticatedLaunchUserEvent" expires_after="M95">
   <owner>zmin@chromium.org</owner>
   <owner>pastarmovj@chromium.org</owner>
   <summary>