[Nearby] Uprev Nearby Connections to 55b5d1a.

A recent commit added support for a verbose log level in the library, so
this change adds a case to ConvertSeverity() to support this change at
build time. (Verbose logs will be filtered out until we update
|g_min_log_severity|, but this is saved for a future change where we can
ensure logging flags and defaults are all behaving correctly.)

Diff in GitHub:
https://github.com/google/nearby-connections/compare/a7b99e7..55b5d1a

Manual regression test results:
https://docs.google.com/spreadsheets/d/1RnMjwDc4KkvxIY9fbjCJnborlawdlJOVfBJWejl6DZM/edit#gid=696477255

Includes:
cl/363510487 - Add a CountDownLatch test.
cl/364035803 - Add more logging.
cl/364232860 - Java change with proto updates.
cl/364353126 - Add flag to cancel listener Registration/Unregistration.
cl/364590475 - Add 'pb' tag around strings representing protos.
cl/364931903 - Cleanup.
cl/365026440 - Add kVerbose serverity level.
cl/365062363 - Extend timeout for creating peer connection.

Change-Id: Ieb885e3be85c5e33d22d62db198304bcc929f324
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2787590
Commit-Queue: Michael Hansen <[email protected]>
Reviewed-by: Josh Nohle <[email protected]>
Cr-Commit-Position: refs/heads/master@{#867467}
diff --git a/DEPS b/DEPS
index de123a28..2f93ad7 100644
--- a/DEPS
+++ b/DEPS
@@ -356,7 +356,7 @@
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling nearby
   # and whatever else without interference from each other.
-  'nearby_revision': 'a7b99e7509c3734b94a151739bc4035de6497a37',
+  'nearby_revision': '55b5d1a1940d9354671bcaa73175105db2dbdc74',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling securemessage
   # and whatever else without interference from each other.