release: prepare changelog for 2.17.3

changelog.asc

@@ -2,7 +2,7 @@
 :sectanchors:
 = AnkiDroid Changelog
 
-== Version 2.17.2 (20240301)
+== Version 2.17.3 (20240301)
 * More stability / polishing on the huge 2.17.0 release - see changelog for 2.17.0 below!
 * We really appreciate the https://opencollective.com/ankidroid[donations], they paid for these fixes 🤝
 * Fix crash sharing to AnkiDroid before first run
@@ -13,6 +13,9 @@
 * Fix many UI theming issues (colors, transparency etc)
 * https://crowdin.com/project/ankidroid[New community-provided language translations]
 
+== Version 2.17.2
+* Unreleased
+
 == Version 2.17.1 (20240225)
 * Mostly stability fixes for the huge 2.17.0 release - see changelog for it below!
 * Always free, always open source, but you may https://opencollective.com/ankidroid[donate if you like 😊]