fix bin files for PHP8 (#315)

bin/clean

@@ -1,6 +1,6 @@
 #!/usr/bin/env php
 <?php
-(PHP_MAJOR_VERSION >= 7 && PHP_MINOR_VERSION >= 1) ?: die('Sorry, PHP 7.1 or above is required to run XBackBone.');
+((PHP_MAJOR_VERSION >= 7 && PHP_MINOR_VERSION >= 1) || PHP_MAJOR_VERSION > 7) ?: die('Sorry, PHP 7.1 or above is required to run XBackBone.');
 if (php_sapi_name() !== 'cli') {
 	die();
 }

bin/migrate

@@ -1,6 +1,6 @@
 #!/usr/bin/env php
 <?php
-(PHP_MAJOR_VERSION >= 7 && PHP_MINOR_VERSION >= 1) ?: die('Sorry, PHP 7.1 or above is required to run XBackBone.');
+((PHP_MAJOR_VERSION >= 7 && PHP_MINOR_VERSION >= 1) || PHP_MAJOR_VERSION > 7) ?: die('Sorry, PHP 7.1 or above is required to run XBackBone.');
 if (php_sapi_name() !== 'cli') {
     die();
 }

bin/theme

@@ -1,6 +1,6 @@
 #!/usr/bin/env php
 <?php
-(PHP_MAJOR_VERSION >= 7 && PHP_MINOR_VERSION >= 1) ?: die('Sorry, PHP 7.1 or above is required to run XBackBone.');
+((PHP_MAJOR_VERSION >= 7 && PHP_MINOR_VERSION >= 1) || PHP_MAJOR_VERSION > 7) ?: die('Sorry, PHP 7.1 or above is required to run XBackBone.');
 if (php_sapi_name() !== 'cli') {
 	die();
 }