ext/curl: Fix failing tests due to string changes in libcurl 8.6.0

Upstream libcurl 8.6.0 contains a change[^1] that caused a test failure.
This fixes it by updating the test's `EXPECTF` to use a regex to account for both string patterns.

[^1]: curl/curl@45cf4755e71f#diff-a8a54563608f8155973318f4ddb61d7328dab512b8ff2b5cc48cc76979d4204cL1683

Closes GH-13293.

Author: Ayesh

ext/curl/tests/bug77946.phpt

@@ -34,4 +34,4 @@ curl_multi_close($mh);
 --EXPECTF--
 int(1)
 int(1)
-string(%d) "Protocol %Sunknown%S not supported or disabled in libcurl"
+string(%d) "Protocol %Sunknown%S %rnot supported( or disabled in libcurl)?%r"