feat: Update default PHP version to 8.4

This commit updates the default PHP version used by the action to 8.4.
It also updates the README to reflect this change and adds badges for new workflows.

Author: hussainweb

README.md

@@ -1,5 +1,11 @@
 # GitHub Action for DrupalQA
 
+[![GitHub Super-Linter](https://github.com/hussainweb/drupalqa-action/actions/workflows/linter.yml/badge.svg)](https://github.com/super-linter/super-linter)
+![CI](https://github.com/hussainweb/drupalqa-action/actions/workflows/ci.yml/badge.svg)
+[![Check dist/](https://github.com/hussainweb/drupalqa-action/actions/workflows/check-dist.yml/badge.svg)](https://github.com/hussainweb/drupalqa-action/actions/workflows/check-dist.yml)
+[![CodeQL](https://github.com/hussainweb/drupalqa-action/actions/workflows/codeql-analysis.yml/badge.svg)](https://github.com/hussainweb/drupalqa-action/actions/workflows/codeql-analysis.yml)
+[![Coverage](./badges/coverage.svg)](./badges/coverage.svg)
+
 This action runs checks from [DrupalQA](https://github.com/hussainweb/drupalqa)
 on a Drupal codebase. While you can directly use the Docker image with GitHub
 Actions, this Action makes it simpler to specify and configure some of the
@@ -10,14 +16,14 @@ checks.
 ### `php-version`
 
 The PHP version to use (corresponds to the Docker image). Allowed options and
-their corresponding Docker images are as follows. Default: `8.2`.
+their corresponding Docker images are as follows. Default: `8.4`.
 
 | php-version | Docker image                                 |
 | ----------- | -------------------------------------------- |
 | 7.3         | hussainweb/drupalqa:php7.3 (_not supported_) |
 | 7.4         | hussainweb/drupalqa:php7.4 (_not supported_) |
 | 8.0         | hussainweb/drupalqa:php8.0 (_not supported_) |
-| 8.1         | hussainweb/drupalqa:php8.1                   |
+| 8.1         | hussainweb/drupalqa:php8.1 (_not supported_) |
 | 8.2         | hussainweb/drupalqa:php8.2                   |
 | 8.3         | hussainweb/drupalqa:php8.3                   |
 | 8.4         | hussainweb/drupalqa:php8.4                   |
@@ -61,7 +67,7 @@ No outputs.
 ```yaml
 uses: hussainweb/drupalqa@v1
 with:
-  php-version: 8.2
+  php-version: 8.4
   checks: |
     phplint: {}
     phpcs:

action.yml

@@ -4,7 +4,7 @@ inputs:
   php-version: # id of input
     description: 'PHP version.'
     required: false
-    default: '8.2'
+    default: '8.4'
   web-root:
     description:
       'Web root (document root). This is set to web by default. Do not include