Add a git_hooks_path config key.

[Shkeats]

Add a git_hooks_path config key that allows a user to point the package to the correct path to place githooks for their project. This should be a non breaking change for existing users due to the default value provided in the config() call.

Motivation:
I wasn't able to get the package working as I was installing it in a git submodules setup where the Laravel project was a submodule in a large project. In that context the correct path for the git hooks is higher in the directory structure. This PR gives package users the option to configure that path so they can use it with git submodules (while keeping the existing default the same.)

CI Fix
The CI was failing already on master for Laravel 9, I've fixed this by adding an appropriate version of orchestra/testbench to the composer.json.

[what-the-diff]

PR Summary

• Update of Testbench versions allowed
  Our project's composer.json file, which helps manage our project dependencies (i.e. other external code we rely on), will now accept versions 7.0.0, 8.0.0, and 9.0.0 of a software testing tool called Testbench. This means we can use newer versions of Testbench in our project, keeping our tools up-to-date.

• New configuration for Git Hooks storage
  We've added a new configuration option (essentially a value we can set to change the behavior of our software) to the config/git-hooks.php file. This option allows us to specify where we store our Git hooks, which are pieces of code that automate tasks when specific actions occur in our project's Git repository.

• Modification to GitHooks Directory Retrieval
  Inside src/GitHooks.php (a file where we define how our Git hooks work), we've adjusted the getGitHooksDir() function – a piece of our software responsible for finding where Git hooks are stored. Now, it will use our new 'git_hooks_path' configuration option if it's set; otherwise, revert to the default storage location. This provides more flexibility in how we manage and utilize our Git hooks.

[joe-niland]

@igorsgm I have tested this branch and it helped in my case where we have the Laravel project in src/ but .git/ is in the root