CI: correct BB_HASHSERVE_UPSTREAM

The BB_HASHSERVE_UPSTREAM has issues which cause significantly less of a
match than expected.  Update with the correct values to get the expected
behavior.

Fixes: 6e9525115bd4 ("CI: add Yocto Project SSTATE Mirror")
Signed-off-by: Jon Mason <jon.mason@arm.com>

ci/sstate-mirror.yml

@@ -5,7 +5,7 @@ header:
 
 local_conf_header:
   sstate_mirror: |
-    BB_HASHSERVE_UPSTREAM = "hashserv.yocto.io:8687"
+    BB_HASHSERVE_UPSTREAM = "wss://hashserv.yoctoproject.org/ws"
     SSTATE_MIRRORS = "file://.* http://cdn.jsdelivr.net/yocto/sstate/all/PATH;downloadfilename=PATH"
     BB_HASHSERVE = "auto"
     BB_SIGNATURE_HANDLER = "OEEquivHash"