Prepare 1.30.5rc0. (#11848)

[ci skip-rust]# Delete this line to force CI to run Clippy and the Rust tests.
[ci skip-rust-tests]
# Delete this line to force CI to run the JVM tests.
[ci skip-jvm-tests]

src/python/pants/notes/1.30.x.rst

@@ -5,6 +5,15 @@ This document describes releases leading up to the ``1.30.x`` ``stable`` series.
 
 See https://pants.readme.io/v1.30/docs/release-notes-1-30 for an overview of the changes in this release.
 
+1.30.5rc0 (4/5/2021)
+--------------------
+
+* Remove watchman. (#10114) (#11824)
+ `PR #11824 <https://github.com/pantsbuild/pants/pull/11824>`_
+
+* Update some deps to keep 1.30.x building. (#11843)
+ `PR #11843 <https://github.com/pantsbuild/pants/pull/11843>`_
+
 1.30.4 (3/19/2021)
 ------------------