Update PHPStan baseline for new deprecation warnings

Added deprecation warnings for `$icon` parameter in `PublicKeyCredentialEntity` per web-auth/webauthn-lib 5.1.0. This ensures accurate tracking of planned changes for future compatibility.

phpstan-baseline.neon

@@ -2100,6 +2100,12 @@ parameters:
 			count: 1
 			path: src/webauthn/src/MetadataService/Statement/MetadataStatement.php
 
+		-
+			message: '#^Since web\-auth/webauthn\-lib 5\.1\.0\: The parameter "\$icon" is deprecated since 5\.1\.0 and will be removed in 6\.0\.0\. This value has no effect\. Please set "null" instead\.\.$#'
+			identifier: todoBy.sfDeprecation
+			count: 1
+			path: src/webauthn/src/PublicKeyCredentialEntity.php
+
 		-
 			message: '#^Parameter \#1 \$extensions of static method Webauthn\\AuthenticationExtensions\\AuthenticationExtensions\:\:create\(\) expects array\<Webauthn\\AuthenticationExtensions\\AuthenticationExtension\>, array\<Webauthn\\AuthenticationExtensions\\AuthenticationExtensions\> given\.$#'
 			identifier: argument.type