Minor Changes for Cygwin (#3070)

No source code changes. Mitoteam added a change to better accomodate Cygwin; pick up their new release. While testing, discovered one test that was already skipped on Windows and needs to be skipped on Cygwin as well.

Author: oleibman

composer.json

@@ -81,7 +81,7 @@
         "dealerdirect/phpcodesniffer-composer-installer": "dev-master",
         "dompdf/dompdf": "^1.0 || ^2.0",
         "friendsofphp/php-cs-fixer": "^3.2",
-        "mitoteam/jpgraph": "10.2.3",
+        "mitoteam/jpgraph": "10.2.4",
         "mpdf/mpdf": "8.1.1",
         "phpcompatibility/php-compatibility": "^9.3",
         "phpstan/phpstan": "^1.1",

composer.lock

@@ -87,12 +87,14 @@ public function testNotExists(): void
 
     public function testNotReadable(): void
     {
-        if (PHP_OS_FAMILY === 'Windows') {
+        if (PHP_OS_FAMILY === 'Windows' || stristr(PHP_OS, 'CYGWIN') !== false) {
             self::markTestSkipped('chmod does not work reliably on Windows');
         }
         $this->tempfile = $temp = File::temporaryFileName();
         file_put_contents($temp, '');
-        chmod($temp, 0070);
+        if (chmod($temp, 0070) === false) {
+            self::markTestSkipped('chmod failed');
+        }
         self::assertFalse(File::testFileNoThrow($temp));
         $this->expectException(ReaderException::class);
         $this->expectExceptionMessage('for reading');