Prepare mbed-tools release 7.53.0

Author: monty-bot

CHANGELOG.md

@@ -12,6 +12,15 @@ beta releases are not included in this history. For a full list of all releases,
 
 [//]: # (begin_release_notes)
 
+7.53.0 (2022-03-22)
+===================
+
+Features
+--------
+
+- Targets modified: NUCLEO-U575ZI-Q. (#20220322050209)
+
+
 7.52.0 (2022-02-23)
 ===================
 

src/mbed_tools/targets/_internal/data/board_database_snapshot.json

@@ -496,7 +496,9 @@
  "target_type": "platform",
  "slug": "NUCLEO-U575ZI-Q",
  "build_variant": [],
- "mbed_os_support": [],
+ "mbed_os_support": [
+ "Mbed OS 6.15"
+ ],
  "mbed_enabled": []
  },
  {