Update version to 2025.3.4 and add changelog (#797)

Author: tomasMizera

Mergin/metadata.txt

@@ -4,14 +4,17 @@ name=Mergin
 qgisMinimumVersion=3.22
 qgisMaximumVersion=4.99
 description=Handle Mergin Maps projects
-version=2025.3.3
+version=2025.3.4
 author=Lutra Consulting
 email=info@merginmaps.com
 about=Mergin Maps is a repository for storing and tracking changes to QGIS projects/data and has its mobile app for field geo-surveys. With this plugin, users can upload and sync their data to Mergin Maps service.
 ; end of mandatory metadata
 
 ; start of optional metadata
-changelog=2025.3.3
+changelog=2025.3.4
+  - Introducing photo sketching for public use
+  - Added support for QGIS 4+
+  <p>2025.3.3
   - Fixed issue with the access token structure
   <p>2025.3.2
   - Added the ability to control layer sort order in the mobile app