Revert "Requests: Combine handling of Exception and InvalidArgument in one catch"

Multi-catch is PHP 7.1+, and we still need to support 5.6

This reverts commit 11faa0f.

Author: pprkut

src/Requests.php

@@ -473,11 +473,19 @@ public static function request($url, $headers = [], $data = [], $type = self::GE
 			$options['hooks']->dispatch('requests.before_parse', [&$response, $url, $headers, $data, $type, $options]);
 
 			$parsed_response = self::parse_response($response, $url, $headers, $data, $options);
-		} catch (Exception|InvalidArgument $e) {
+		} catch (Exception $e) {
+			if ($e->failed_hook_handled === FALSE) {
+				$options['hooks']->dispatch('requests.failed', [&$e, $url, $headers, $data, $type, $options]);
+				$e->failed_hook_handled = TRUE;
+			}
+
+			throw $e;
+		} catch (InvalidArgument $e) {
 			if ($e->failed_hook_handled === FALSE) {
 				$options['hooks']->dispatch('requests.failed', [&$e, $url, $headers, $data, $type, $options]);
 				$e->failed_hook_handled = TRUE;
 			}
+
 			throw $e;
 		}