Use getenv() instead of $_ENV in bootstrap file to ensure environment variables are accessible

This PR updates the `bootstrap` file to use `getenv()` instead of `$_ENV` when retrieving environment variables.

In some PHP configurations, `$_ENV` returns `null` unless the `variables_order` setting in `php.ini` includes the `E` flag. This can cause Octane to fail when resolving the application base path or vendor directory.

By switching to `getenv()`, Octane can reliably fetch environment variables without requiring users to modify their PHP configuration.

### Changes
- Replaced `$_ENV['APP_RUNNING_IN_CONSOLE']` with `getenv('APP_RUNNING_IN_CONSOLE')`.
- Ensured `COMPOSER_VENDOR_DIR` and other variables are resolved consistently.

### Why
When extending the Swoole server start process and attempting to change the vendor file path, `$_ENV` returned `null` unless `variables_order` was explicitly configured. This fix ensures smoother setup for developers across different environments.

### Impact
- No breaking changes.
- Improves reliability of environment variable handling in Swoole/Octane bootstrap.

Author: 7amoood

bin/bootstrap.php

@@ -15,7 +15,7 @@
 |
 */
 
-$basePath = $_SERVER['APP_BASE_PATH'] ?? $_ENV['APP_BASE_PATH'] ?? $serverState['octaneConfig']['base_path'] ?? null;
+$basePath = $_SERVER['APP_BASE_PATH'] ?? getenv('APP_BASE_PATH') ?? $serverState['octaneConfig']['base_path'] ?? null;
 
 if (! is_string($basePath)) {
     echo 'Cannot find application base path.';
@@ -35,7 +35,7 @@
 |
 */
 
-$vendorDir = $_ENV['COMPOSER_VENDOR_DIR'] ?? "{$basePath}/vendor";
+$vendorDir = getenv('COMPOSER_VENDOR_DIR') ?? "{$basePath}/vendor";
 
 if (! is_file($autoload_file = "{$vendorDir}/autoload.php")) {
     echo "Composer autoload file was not found. Did you install the project's dependencies?";