Update minikube to 0.31.0 (#55944)

- [x] brew cask audit --download {{cask_file}} is error-free.
- [x] brew cask style --fix {{cask_file}} reports no offenses.
- [x] The commit message includes the cask’s name and version.

Casks/minikube.rb

@@ -1,6 +1,6 @@
 cask 'minikube' do
-  version '0.30.0'
-  sha256 'e09789c4eb751969f712947a43effd79cf73488163563e79d98bc3d15d06831e'
+  version '0.31.0'
+  sha256 '621189b5ec9cbb55003ee3577d480e847c0f80a9ed58f4fb3ed567bb7be623a1'
 
   # storage.googleapis.com/minikube was verified as official when first introduced to the cask
   url "https://storage.googleapis.com/minikube/releases/v#{version}/minikube-darwin-amd64"