Remove requireProofKey warning for non-auth-code flows

The warning is unnecessary since PKCE only applies to authorization_code
flow and the code already corrects this silently.

Closes: gh-18221

Signed-off-by: Andrey Litvitski <andrey1010102008@gmail.com>

Author: therepanic

oauth2/oauth2-client/src/main/java/org/springframework/security/oauth2/client/registration/ClientRegistration.java

@@ -705,9 +705,6 @@ private void validateAuthorizationGrantTypes() {
 			if (!AuthorizationGrantType.AUTHORIZATION_CODE.equals(this.authorizationGrantType)
 					&& this.clientSettings.isRequireProofKey()) {
 				this.clientSettings = ClientSettings.builder().requireProofKey(false).build();
-				logger.warn(LogMessage.format(
-						"clientSettings.isRequireProofKey=true is only valid with authorizationGrantType=%s. Got authorizationGrantType=%s. Resetting to clientSettings.isRequireProofKey=false",
-						AuthorizationGrantType.AUTHORIZATION_CODE, this.authorizationGrantType));
 			}
 		}