Upgrade grpc to 150 and C++ to 14 For Cocoapods and SPM (#10650)

* Upgrade grpc to 150 and C++ to 14 on Cocoapods and SPM

* Minor fixes

* try 1.50.1

* Fix style

Author: wu-hui

FirebaseFirestore.podspec

@@ -90,7 +90,7 @@ Google Cloud Firestore is a NoSQL document database built for automatic scaling,
 
   s.dependency 'FirebaseCore', '~> 10.0'
 
-  abseil_version = '~> 1.20211102.0'
+  abseil_version = '~> 1.20220623.0'
   s.dependency 'abseil/algorithm', abseil_version
   s.dependency 'abseil/base', abseil_version
   s.dependency 'abseil/container/flat_hash_map', abseil_version
@@ -100,7 +100,7 @@ Google Cloud Firestore is a NoSQL document database built for automatic scaling,
   s.dependency 'abseil/time', abseil_version
   s.dependency 'abseil/types', abseil_version
 
-  s.dependency 'gRPC-C++', '~> 1.44.0'
+  s.dependency 'gRPC-C++', '~> 1.50.1'
   s.dependency 'leveldb-library', '~> 1.22'
   s.dependency 'nanopb', '>= 2.30908.0', '< 2.30910.0'
 
@@ -110,7 +110,7 @@ Google Cloud Firestore is a NoSQL document database built for automatic scaling,
 
   s.library = 'c++'
   s.pod_target_xcconfig = {
-    'CLANG_CXX_LANGUAGE_STANDARD' => 'c++0x',
+    'CLANG_CXX_LANGUAGE_STANDARD' => 'c++14',
     'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_PREPROCESSOR_DEFINITIONS' =>
       "FIRFirestore_VERSION=#{s.version} " +