Convert OpenSSL X.509 CSR resource to object

Author: kocsismate

UPGRADING

@@ -345,6 +345,9 @@ PHP 8.0 UPGRADE NOTES
   . The openssl_x509_free() function no longer has an effect, instead the
     X509Certificate instance is automatically destroyed if it is no longer
     referenced.
+  . openssl_csr_new() will now return an X509CertificateSigningRequest object
+    rather than a resource. Return value checks using is_resource() should be
+    replaced with checks for `false`.
 
 - PCRE:
   . When passing invalid escape sequences they are no longer interpreted as