Prepare for release to 2.52.0 (#9504)

diff --git a/flutter-candidate.txt b/flutter-candidate.txt
index ae461d6..c0ffef3 100644
--- a/flutter-candidate.txt
+++ b/flutter-candidate.txt
@@ -1 +1 @@
-c63c6b08a7114517575bcf3e45275ec7a9f4e87f
+bd24c21d833b4dd046cd5d2a3440c030145cbbbd