use floating versions for abseil

gRPC-C++.podspec

@@ -226,7 +226,7 @@ Pod::Spec.new do |s|
     ss.dependency "#{s.name}/Privacy", version
     ss.dependency "#{s.name}/Interface", version
     ss.dependency 'gRPC-Core', version
-    abseil_version = '1.20240116.2'
+    abseil_version = '~> 1.20240116.2'
     ss.dependency 'abseil/algorithm/container', abseil_version
     ss.dependency 'abseil/base/base', abseil_version
     ss.dependency 'abseil/base/config', abseil_version

gRPC-Core.podspec

@@ -46,7 +46,7 @@ Pod::Spec.new do |s|
   s.requires_arc = false
 
   name = 'grpc'
-  abseil_version = '1.20240116.2'
+  abseil_version = '~> 1.20240116.2'
 
   # When creating a dynamic framework, name it grpc.framework instead of gRPC-Core.framework.
   # This lets users write their includes like `#include <grpc/grpc.h>` as opposed to `#include

templates/gRPC-C++.podspec.template

@@ -183,7 +183,7 @@
       ss.dependency "#{s.name}/Privacy", version
       ss.dependency "#{s.name}/Interface", version
       ss.dependency 'gRPC-Core', version
-      abseil_version = '1.20240116.2'
+      abseil_version = '~> 1.20240116.2'
       % for abseil_spec in grpcpp_abseil_specs:
       ss.dependency '${abseil_spec}', abseil_version
       % endfor

templates/gRPC-Core.podspec.template

@@ -122,7 +122,7 @@
     s.requires_arc = false
 
     name = 'grpc'
-    abseil_version = '1.20240116.2'
+    abseil_version = '~> 1.20240116.2'
 
     # When creating a dynamic framework, name it grpc.framework instead of gRPC-Core.framework.
     # This lets users write their includes like `#include <grpc/grpc.h>` as opposed to `#include