chore: update packages/flutter/scripts/update-native.sh to 0.13.8 (#3667)

Co-authored-by: GitHub <[email protected]>

Author: github-actions[bot]

packages/flutter/sentry-native/CMakeCache.txt

@@ -2,4 +2,4 @@
 # Basically, this is a properties file we use both in CMake and update-deps.yml to update dependencies.
 
 repo=https://github.com/getsentry/sentry-native
-version=0.13.7
+version=0.13.8