Replaced webmozart/path-util dependency with @internal `Path::isA…

…bsolute()`

This imports sources from `webmozart/path-util`: since the license
and authors are the same, no further license additions are necessary.

Ref: https://github.com/webmozart/path-util/blob/6099b5238073f87f246863fd58c2e447acfc0d24/tests/PathTest.php
Ref: https://github.com/webmozart/path-util/blob/6099b5238073f87f246863fd58c2e447acfc0d24/src/Path.php

Fixes #59
Fixes #57

README.md

@@ -114,19 +114,13 @@ $iterator = new GlobFilterIterator(
 
 Relative globs such as `*.css` are not supported. Usually, such globs refer to
 paths relative to the current working directory. This utility, however, does not
-want to make such assumptions. Hence you should always pass absolute globs.
-
-If you want to allow users to pass relative globs, I recommend to turn the globs
-into absolute globs using the [Webmozart Path Utility]:
+want to make such assumptions. Hence you should always pass absolute globs, so
+usage of `__DIR__` is encouraged:
 
 ```php
 use Webmozart\Glob\Glob;
-use Webmozart\PathUtil\Path;
 
-// If $glob is absolute, that glob is used without modification.
-// If $glob is relative, it is turned into an absolute path based on the current
-// working directory.
-$paths = Glob::glob(Path::makeAbsolute($glob, getcwd());
+$paths = Glob::glob(__DIR__ . '/*');
 ```
 
 ### Windows Compatibility

composer.json

@@ -9,8 +9,7 @@
         }
     ],
     "require": {
-        "php": "^7.3 || ^8.0.0",
-        "webmozart/path-util": "^2.2"
+        "php": "^7.3 || ^8.0.0"
     },
     "require-dev": {
         "symfony/filesystem": "^5.3",