chore: update snippets to v7.0.0 (#152)

* chore: update snippets to v7.0.0

* chore: revert Cartfile changes until Carthage can support v7.0.0

Author: wangela

snippets/MapsSnippets/Podfile

@@ -1,6 +1,6 @@
 source 'https://github.com/CocoaPods/Specs.git'
 
 target 'MapsSnippets' do
-    platform :ios, '12.0'
-    pod 'GoogleMaps', '6.2.1'
+    platform :ios, '13.0'
+    pod 'GoogleMaps', '7.0.0'
 end

snippets/MapsUtilsSnippets/Podfile

@@ -3,7 +3,7 @@ source 'https://github.com/CocoaPods/Specs.git'
 use_frameworks!
 
 target 'MapsUtilsSnippets' do
-    platform :ios, '12.0'
-    pod 'GoogleMaps', '6.2.1'
+    platform :ios, '13.0'
+    pod 'GoogleMaps', '7.0.0'
     pod 'Google-Maps-iOS-Utils', '4.1.0'
 end

snippets/PlacesSnippets/Podfile

@@ -1,7 +1,7 @@
 source 'https://github.com/CocoaPods/Specs.git'
 
 target 'PlacesSnippets' do
-    platform :ios, '12.0'
-    pod 'GooglePlaces', '6.2.1'
-    pod 'GoogleMaps', '6.2.1'
+    platform :ios, '13.0'
+    pod 'GooglePlaces', '7.0.0'
+    pod 'GoogleMaps', '7.0.0'
 end

snippets/Podfile

@@ -1,19 +1,19 @@
 # [START maps_ios_get_started_install_podfile]
 source 'https://github.com/CocoaPods/Specs.git'
 
-platform :ios, '12.0'
+platform :ios, '13.0'
 
 target 'YOUR_APPLICATION_TARGET_NAME_HERE' do
-  pod 'GoogleMaps', '6.2.1'
+  pod 'GoogleMaps', '7.0.0'
 end
 # [END maps_ios_get_started_install_podfile]
 
 # [START maps_ios_places_get_started_install_podfile]
 source 'https://github.com/CocoaPods/Specs.git'
 
-platform :ios, '12.0'
+platform :ios, '13.0'
 
 target 'YOUR_APPLICATION_TARGET_NAME_HERE' do
-  pod 'GooglePlaces', '6.2.1'
+  pod 'GooglePlaces', '7.0.0'
 end
 # [END maps_ios_places_get_started_install_podfile]