Update dependencies

vendor/symfony/mime/Crypto/DkimOptions.php

@@ -28,7 +28,7 @@ final class DkimOptions
     /**
      * @return $this
      */
-    public function algorithm(int $algo): self
+    public function algorithm(string $algo): self
     {
         $this->options['algorithm'] = $algo;
 

vendor/symfony/mime/Email.php

@@ -272,12 +272,16 @@ class Email extends Message
     }
 
     /**
-     * @param resource|string $body
+     * @param resource|string|null $body
      *
      * @return $this
      */
     public function text($body, string $charset = 'utf-8')
     {
+        if (null !== $body && !\is_string($body) && !\is_resource($body)) {
+            throw new \TypeError(sprintf('The body must be a string, a resource or null (got "%s").', get_debug_type($body)));
+        }
+
         $this->text = $body;
         $this->textCharset = $charset;
 
@@ -304,6 +308,10 @@ class Email extends Message
      */
     public function html($body, string $charset = 'utf-8')
     {
+        if (null !== $body && !\is_string($body) && !\is_resource($body)) {
+            throw new \TypeError(sprintf('The body must be a string, a resource or null (got "%s").', get_debug_type($body)));
+        }
+
         $this->html = $body;
         $this->htmlCharset = $charset;
 
@@ -330,6 +338,10 @@ class Email extends Message
      */
     public function attach($body, string $name = null, string $contentType = null)
     {
+        if (!\is_string($body) && !\is_resource($body)) {
+            throw new \TypeError(sprintf('The body must be a string or a resource (got "%s").', get_debug_type($body)));
+        }
+
         $this->attachments[] = ['body' => $body, 'name' => $name, 'content-type' => $contentType, 'inline' => false];
 
         return $this;
@@ -352,6 +364,10 @@ class Email extends Message
      */
     public function embed($body, string $name = null, string $contentType = null)
     {
+        if (!\is_string($body) && !\is_resource($body)) {
+            throw new \TypeError(sprintf('The body must be a string or a resource (got "%s").', get_debug_type($body)));
+        }
+
         $this->attachments[] = ['body' => $body, 'name' => $name, 'content-type' => $contentType, 'inline' => true];
 
         return $this;
@@ -463,7 +479,7 @@ class Email extends Message
         $names = [];
         $htmlPart = null;
         $html = $this->html;
-        if (null !== $this->html) {
+        if (null !== $html) {
             $htmlPart = new TextPart($html, $this->htmlCharset, 'html');
             $html = $htmlPart->getBody();
             preg_match_all('(<img\s+[^>]*src\s*=\s*(?:([\'"])cid:([^"]+)\\1|cid:([^>\s]+)))i', $html, $names);

vendor/symfony/mime/Part/DataPart.php

@@ -61,13 +61,20 @@ class DataPart extends TextPart
             $contentType = self::$mimeTypes->getMimeTypes($ext)[0] ?? 'application/octet-stream';
         }
 
-        if (false === is_readable($path)) {
+        if ((is_file($path) && !is_readable($path)) || is_dir($path)) {
             throw new InvalidArgumentException(sprintf('Path "%s" is not readable.', $path));
         }
 
         if (false === $handle = @fopen($path, 'r', false)) {
             throw new InvalidArgumentException(sprintf('Unable to open path "%s".', $path));
         }
+
+        if (!is_file($path)) {
+            $cache = fopen('php://temp', 'r+');
+            stream_copy_to_stream($handle, $cache);
+            $handle = $cache;
+        }
+
         $p = new self($handle, $name ?: basename($path), $contentType);
         $p->handle = $handle;
 

vendor/symfony/mime/Test/Constraint/EmailHeaderSame.php

@@ -55,12 +55,14 @@ final class EmailHeaderSame extends Constraint
      */
     protected function failureDescription($message): string
     {
-        return sprintf('the Email %s (value is %s)', $this->toString(), $this->getHeaderValue($message));
+        return sprintf('the Email %s (value is %s)', $this->toString(), $this->getHeaderValue($message) ?? 'null');
     }
 
-    private function getHeaderValue($message): string
+    private function getHeaderValue($message): ?string
     {
-        $header = $message->getHeaders()->get($this->headerName);
+        if (null === $header = $message->getHeaders()->get($this->headerName)) {
+            return null;
+        }
 
         return $header instanceof UnstructuredHeader ? $header->getValue() : $header->getBodyAsString();
     }