chore: Release 5.7.7 (#2604)

Co-authored-by: github-actions[bot] <noreply@onesignal.com>
Co-authored-by: Fadi George <fadii925@gmail.com>

Author: 3 people

OneSignalSDK/gradle.properties

@@ -33,4 +33,4 @@ android.useAndroidX = true
 
 # This is the name of the SDK to use when building your project.
 # This will be fed from the GitHub Actions workflow.
-SDK_VERSION=5.7.6
+SDK_VERSION=5.7.7

examples/demo/gradle.properties

@@ -19,3 +19,7 @@ android.useAndroidX=true
 # resources declared in the library itself and none from the library's dependencies,
 # thereby reducing the size of the R class for that library
 android.nonTransitiveRClass=true
+
+# SDK version used when the demo is opened standalone (without the SDK source).
+# Updated automatically by the release workflow.
+SDK_VERSION=5.7.6