fix: php port replacement removes entire line in site config (#43)

Fixes #42.

This pull request makes a minor update to the way the PHP port is
replaced in the site configuration within the
`replacePhpVersionInSiteConf` function. The change simplifies the usage
of replacement variables in the `preg_replace` call, improving
readability and maintainability.

- Refactored the `preg_replace` replacement string in the
`replacePhpVersionInSiteConf` function in `Site.php` to use string
concatenation with `${1}` instead of double-quoted interpolation with
`$1`, ensuring correct variable substitution and preventing entire line
removal with the wrong interpretation of the backreference numbers.

- Removed the limit of max replacements the `preg_replace` can do,
ensuring all PHP port lines in multiple location blocks in the site
configs are replaced.

Author: yCodeTech

cli/Valet/Site.php

@@ -992,9 +992,8 @@ public function replacePhpVersionInSiteConf($siteConf, $phpPort, $phpVersion = n
 		// or global variable, depending on whether the site is isolated or not.
 		$siteConf = preg_replace(
 			'/(^\s*set \$valet_site_php_port\s+)[^;]+(\s*;)/m',
-			"$1{$phpPortValue}$2",
-			$siteConf,
-			1
+			'${1}' . $phpPortValue . '$2',
+			$siteConf
 		);
 
 		if ($phpVersion) {