put new bridge auth Serge into place

The "Bifroest" bridge authority has been retired; the new bridge authority
is "Serge", and it is operated by George from the TorBSD project.

Closes ticket 26771.

changes/task26771

@@ -0,0 +1,4 @@
+  o Directory authority changes:
+    - The "Bifroest" bridge authority has been retired; the new bridge
+      authority is "Serge", and it is operated by George from the
+      TorBSD project. Closes ticket 26771.

src/or/auth_dirs.inc

@@ -8,8 +8,8 @@
 "dizum orport=443 "
   "v3ident=E8A9C45EDE6D711294FADF8E7951F4DE6CA56B58 "
   "194.109.206.212:80 7EA6 EAD6 FD83 083C 538F 4403 8BBF A077 587D D755",
-"Bifroest orport=443 bridge "
-  "37.218.247.217:80 1D8F 3A91 C37C 5D1C 4C19 B1AD 1D0C FBE8 BF72 D8E1",
+"Serge orport=9001 bridge "
+  "66.111.2.131:9030 BA44 A889 E64B 93FA A2B1 14E0 2C2A 279A 8555 C533",
 "gabelmoo orport=443 "
   "v3ident=ED03BB616EB2F60BEC80151114BB25CEF515B226 "
   "ipv6=[2001:638:a000:4140::ffff:189]:443 "