update dependencies

pubspec.yaml

@@ -1,15 +1,15 @@
 name: geoxml
 description: Package for loading, manipulating, and saving GPS data in GPX and KML format.
-version: 2.5.2
+version: 2.5.3
 homepage: https://github.com/sun-jiao/geoxml/
 
 environment:
   sdk: ">=3.0.0 <4.0.0"
 
 dependencies:
-  collection: ^1.16.0
+  collection: ^1.18.0
   quiver: '>=3.0.0 <4.0.0'
-  xml: '^6.3.0'
+  xml: ^6.5.0
 
 dev_dependencies:
   lints: ^2.0.0