[BC] Upgraded dependencies, dropped support for anything below PHP 8.0. (#849)

* GitHub actions + style fixes + updated packages

* Fixed workflows dir

* Support for PHP 8.1 (#1)

* Update README.md

* Revert some changes from upstream

tests/FFMpeg/Unit/Media/AbstractStreamableTestCase.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace Tests\FFMpeg\Unit\Media;
+
+abstract class AbstractStreamableTestCase extends AbstractMediaTestCase
+{
+    public function testGetStreams()
+    {
+        $classname = $this->getClassName();
+        $ffprobe = $this->getFFProbeMock();
+        $format = $this->getFormatMock();
+
+        $ffprobe->expects($this->once())
+            ->method('format')
+            ->with(__FILE__)
+            ->will($this->returnValue($format));
+
+        $media = new $classname(__FILE__, $this->getFFMpegDriverMock(), $ffprobe);
+        $this->assertSame($format, $media->getFormat());
+    }
+
+    public function testGetFormat()
+    {
+        $classname = $this->getClassName();
+        $ffprobe = $this->getFFProbeMock();
+        $streams = $this->getStreamCollectionMock();
+
+        $ffprobe->expects($this->once())
+            ->method('streams')
+            ->with(__FILE__)
+            ->will($this->returnValue($streams));
+
+        $media = new $classname(__FILE__, $this->getFFMpegDriverMock(), $ffprobe);
+        $this->assertSame($streams, $media->getStreams());
+    }
+
+    abstract protected function getClassName();
+}