Prepare 2.5.2rc0. (#12388)

[ci skip-rust]

Author: stuhood

src/python/pants/notes/2.5.x.md

@@ -2,6 +2,12 @@
 
 See https://www.pantsbuild.org/v2.5/docs/release-notes-2-5 for an overview of the changes in this release series.
 
+## 2.5.2rc0 (Jul 20, 2021)
+
+### Bug fixes
+
+* Fix anonymous telemetry logging. ([#12345](https://github.com/pantsbuild/pants/pull/12345))
+
 ## 2.5.1 (Jul 12, 2021)
 
 The second stable release of the `2.5.x` series, with no changes since the previous `rc`.