upgrade deps; rewrite smtp session

vendor/github.com/getsentry/sentry-go/.codecov.yml

@@ -0,0 +1,13 @@
+codecov:
+  # across
+  notify:
+    # Do not notify until at least this number of reports have been uploaded
+    # from the CI pipeline. We normally have more than that number, but 6
+    # should be enough to get a first notification.
+    after_n_builds: 6
+coverage:
+  status:
+    project:
+      default:
+        # Do not fail the commit status if the coverage was reduced up to this value
+        threshold: 0.5%