Bug 1477065 - Renew GPU_PROCESS_CRASH_FALLBACKS telemetry histogram probe. r=jrmuizel

This probe is being collected but has expired. I think it makes sense to renew this.

MozReview-Commit-ID: 4mE5lvdDify

--HG--
extra : rebase_source : a39527464c44ab14f5d40e18b588d2ddd0948913

toolkit/components/telemetry/Histograms.json

@@ -859,8 +859,8 @@
   },
   "GPU_PROCESS_CRASH_FALLBACKS": {
     "record_in_processes": ["main", "content"],
-    "alert_emails": ["cpearce@mozilla.com", "gsquelart@mozilla.com"],
-    "expires_in_version": "60",
+    "alert_emails": ["gfx-telemetry-alerts@mozilla.com", "cpearce@mozilla.com", "gsquelart@mozilla.com"],
+    "expires_in_version": "70",
     "bug_numbers": [1338011],
     "kind": "enumerated",
     "releaseChannelCollection": "opt-out",