Fix bad string concatenation in build.gradle (software-mansion#2915)

## Description

This was causing a build crash for me

## Changes

Use + for string concatenation in Groovy

## Test code and steps to reproduce

None

## Checklist

- [ ] Included code example that can be used to test this change
- [ ] Updated TS types
- [ ] Added TS types tests
- [ ] Added unit / integration tests
- [ ] Updated documentation
- [ ] Ensured that CI passes

android-npm/build.gradle

@@ -99,10 +99,10 @@ while (!aar.exists()) {
       println "\n\n\n"
       println "****************************************************************************************"
       println "\n\n\n"
-      println "WARNING reanimated - no version-specific reanimated AAR for react-native version " . minor . " found."
-      println "Falling back to AAR for react-native version " . minorCopy
+      println "WARNING reanimated - no version-specific reanimated AAR for react-native version " + minor + " found."
+      println "Falling back to AAR for react-native version " + minorCopy
       println "The react-native JSI interface is not ABI-safe yet, this may result in crashes."
-      println "Please post a pull request to implement support for react-native version " . minor . " to the reanimated repo."
+      println "Please post a pull request to implement support for react-native version " + minor + " to the reanimated repo."
       println "Thanks!"
       println "\n\n\n"
       println "****************************************************************************************"