Update Sandwich SDK to 7.5.0 (#431)

Author: SpertsyanKM

android/build.gradle

@@ -51,6 +51,6 @@ android {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation "io.qonversion:sandwich:7.4.0"
+    implementation "io.qonversion:sandwich:7.5.0"
     implementation 'com.google.code.gson:gson:2.9.0'
 }

ios/qonversion_flutter.podspec

@@ -16,7 +16,7 @@ Pod::Spec.new do |s|
   s.source_files = 'Classes/**/*'
   s.dependency 'Flutter'
   s.platform = :ios, '13.0'
-  s.dependency "QonversionSandwich", "7.4.0"
+  s.dependency "QonversionSandwich", "7.5.0"
 
   # Flutter.framework does not contain a i386 slice. Only x86_64 simulators are supported.
   s.pod_target_xcconfig = { 'DEFINES_MODULE' => 'YES', 'VALID_ARCHS[sdk=iphonesimulator*]' => 'x86_64' }