chore(release): bump to 5.13.0 (#277)

## 💡 Motivation and Context
release posthog-flutter 5.13.0

<!--- Why is this change required? What problem does it solve? -->
<!--- If it fixes an open issue, please link to the issue here. -->


## 💚 How did you test it?


## 📝 Checklist
<!--- Put an `x` in the boxes that apply -->

- [ ] I reviewed the submitted code.
- [ ] I added tests to verify the changes.
- [ ] I updated the docs if needed.
- [ ] No breaking change or entry added to the changelog.

Author: adboio

CHANGELOG.md

@@ -1,5 +1,7 @@
 ## Next
 
+# 5.13.0
+
 - chore: add support for thumbs up/down surveys ([#257](https://github.com/PostHog/posthog-flutter/pull/257))
 
 - perf: Optimize Screenshot diff check ([#271](https://github.com/PostHog/posthog-flutter/pull/271))

android/src/main/kotlin/com/posthog/flutter/PostHogVersion.kt

@@ -1,3 +1,3 @@
 package com.posthog.flutter
 
-internal val postHogVersion = "5.12.0"
+internal val postHogVersion = "5.13.0"

ios/Classes/PostHogFlutterVersion.swift

@@ -8,4 +8,4 @@
 import Foundation
 
 // This property is internal only
-let postHogFlutterVersion = "5.12.0"
+let postHogFlutterVersion = "5.13.0"

pubspec.yaml

@@ -1,6 +1,6 @@
 name: posthog_flutter
 description: Flutter implementation of PostHog client for iOS, Android and Web
-version: 5.12.0
+version: 5.13.0
 homepage: https://www.posthog.com
 repository: https://github.com/posthog/posthog-flutter
 issue_tracker: https://github.com/posthog/posthog-flutter/issues