Update CocoaPods recommended version to 1.9 (#69809)

dev/ci/mac/Gemfile.lock

 GEM
   remote: https://rubygems.org/
   specs:
-    CFPropertyList (3.0.1)
-    activesupport (4.2.11.1)
+    CFPropertyList (3.0.2)
+    activesupport (4.2.11.3)
       i18n (~> 0.7)
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    algoliasearch (1.27.1)
+    algoliasearch (1.27.5)
       httpclient (~> 2.8, >= 2.8.3)
       json (>= 1.5.1)
     atomos (0.1.3)
     claide (1.0.3)
-    cocoapods (1.8.4)
+    cocoapods (1.9.3)
       activesupport (>= 4.0.2, < 5)
       claide (>= 1.0.2, < 2.0)
-      cocoapods-core (= 1.8.4)
+      cocoapods-core (= 1.9.3)
       cocoapods-deintegrate (>= 1.0.3, < 2.0)
       cocoapods-downloader (>= 1.2.2, < 2.0)
       cocoapods-plugins (>= 1.0.0, < 2.0)
@@ -30,26 +30,31 @@ GEM
       molinillo (~> 0.6.6)
       nap (~> 1.0)
       ruby-macho (~> 1.4)
-      xcodeproj (>= 1.11.1, < 2.0)
-    cocoapods-core (1.8.4)
+      xcodeproj (>= 1.14.0, < 2.0)
+    cocoapods-core (1.9.3)
       activesupport (>= 4.0.2, < 6)
       algoliasearch (~> 1.0)
       concurrent-ruby (~> 1.1)
       fuzzy_match (~> 2.0.4)
       nap (~> 1.0)
+      netrc (~> 0.11)
+      typhoeus (~> 1.0)
     cocoapods-deintegrate (1.0.4)
-    cocoapods-downloader (1.2.2)
+    cocoapods-downloader (1.4.0)
     cocoapods-plugins (1.0.0)
       nap
     cocoapods-search (1.0.0)
     cocoapods-stats (1.1.0)
-    cocoapods-trunk (1.4.1)
+    cocoapods-trunk (1.5.0)
       nap (>= 0.8, < 2.0)
       netrc (~> 0.11)
-    cocoapods-try (1.1.0)
+    cocoapods-try (1.2.0)
     colored2 (3.1.2)
-    concurrent-ruby (1.1.5)
+    concurrent-ruby (1.1.7)
     escape (0.0.4)
+    ethon (0.12.0)
+      ffi (>= 1.3.0)
+    ffi (1.13.1)
     fourflusher (2.3.1)
     fuzzy_match (2.0.4)
     gh_inspector (1.1.3)
@@ -57,21 +62,23 @@ GEM
     i18n (0.9.5)
       concurrent-ruby (~> 1.0)
     json (2.3.1)
-    minitest (5.12.2)
+    minitest (5.14.2)
     molinillo (0.6.6)
-    nanaimo (0.2.6)
+    nanaimo (0.3.0)
     nap (1.1.0)
     netrc (0.11.0)
     ruby-macho (1.4.0)
     thread_safe (0.3.6)
-    tzinfo (1.2.5)
+    typhoeus (1.4.0)
+      ethon (>= 0.9.0)
+    tzinfo (1.2.7)
       thread_safe (~> 0.1)
-    xcodeproj (1.13.0)
+    xcodeproj (1.19.0)
       CFPropertyList (>= 2.3.3, < 4.0)
       atomos (~> 0.1.3)
       claide (>= 1.0.2, < 2.0)
       colored2 (~> 3.1)
-      nanaimo (~> 0.2.6)
+      nanaimo (~> 0.3.0)
 
 PLATFORMS
   ruby
@@ -80,4 +87,4 @@ DEPENDENCIES
   cocoapods
 
 BUNDLED WITH
-  2.0.2
+   2.1.2

packages/flutter_tools/lib/src/macos/cocoapods.dart

@@ -98,7 +98,7 @@ class CocoaPods {
   Future<String> _versionText;
 
   String get cocoaPodsMinimumVersion => '1.6.0';
-  String get cocoaPodsRecommendedVersion => '1.8.0';
+  String get cocoaPodsRecommendedVersion => '1.9.0';
 
   Future<bool> get isInstalled =>
     _processUtils.exitsHappy(<String>['which', 'pod']);

packages/flutter_tools/test/general.shard/macos/cocoapods_test.dart

@@ -181,13 +181,13 @@ void main() {
 
     testWithoutContext('detects at recommended version', () async {
       pretendPodIsInstalled();
-      pretendPodVersionIs('1.8.0');
+      pretendPodVersionIs('1.9.0');
       expect(await cocoaPodsUnderTest.evaluateCocoaPodsInstallation, CocoaPodsStatus.recommended);
     });
 
     testWithoutContext('detects above recommended version', () async {
       pretendPodIsInstalled();
-      pretendPodVersionIs('1.8.1');
+      pretendPodVersionIs('1.9.1');
       expect(await cocoaPodsUnderTest.evaluateCocoaPodsInstallation, CocoaPodsStatus.recommended);
     });