[iOS] Update Cocoapods for 0.14 release (#6870)

* [iOS] Update Cocoapods for 0.14 release

* Update pytorch version in podspec
Co-authored-by: YosuaMichael <yosuamichael@fb.com>

ios/LibTorchvision.podspec

-pytorch_version = '1.12.0'
+pytorch_version = '1.13.0'
 
 Pod::Spec.new do |s|
     s.name             = 'LibTorchvision'
-    s.version          = '0.13.0'
+    s.version          = '0.14.0'
     s.authors          = 'PyTorch Team'
     s.license          = { :type => 'BSD' }
     s.homepage         = 'https://github.com/pytorch/vision'