don't use brew

it's not supported on this macos version?

> Warning: You are using macOS 11.
> We (and Apple) do not provide support for this old version.
> It is expected behaviour that some formulae will fail to build in this old version.
> It is expected behaviour that Homebrew will be buggy and slow.
> Do not create any issues about this on Homebrew's GitHub repositories.
> Do not create any issues even if you think this message is unrelated.
> Any opened issues will be immediately closed without response.
> Do not ask for help from Homebrew or its maintainers on social media.
> You may ask for help in Homebrew's discussions but are unlikely to receive a response.
> Try to figure out the problem yourself and submit a fix as a pull request.
> We will review it but may or may not accept it.
>
> xcbeautify: A full installation of Xcode.app 14.0 is required to compile
> this software. Installing just the Command Line Tools is not sufficient.
>
> Xcode 14.0 cannot be installed on macOS 11.
> You must upgrade your version of macOS.
> Error: xcbeautify: An unsatisfied requirement failed this build.
> Error: Process completed with exit code 1.

.github/workflows/integration-test-iOS14_4.yaml

@@ -47,7 +47,6 @@ jobs:
 
       - name: Install Dependencies and Run Tests
         run: |
-          brew install xcbeautify
           make submodules
           bundle install
           make update_carthage_dependencies_ios

.github/workflows/integration-test-macOS10_15.yaml

@@ -47,7 +47,6 @@ jobs:
 
       - name: Install Dependencies and Run Tests
         run: |
-          brew install xcbeautify
           make submodules
           bundle install
           make update_carthage_dependencies_macos

.github/workflows/integration-test-tvOS14_3.yaml

@@ -47,7 +47,6 @@ jobs:
 
       - name: Install Dependencies and Run Tests
         run: |
-          brew install xcbeautify
           make submodules
           bundle install
           make update_carthage_dependencies_tvos