Unity lite bump (#3413)

Author: bruno-garcia

src/includes/getting-started-install/unity.mdx

@@ -1,5 +1,5 @@
 Get the SDK via the [Unity Package Manager using a Git URL](https://docs.unity3d.com/Manual/upm-ui-giturl.html) to Sentry's SDK repository:
 
 ```
-https://github.com/getsentry/sentry-unity-lite.git#1.0.2
+https://github.com/getsentry/sentry-unity-lite.git#1.0.3
 ```