Remove deprecations in JwtAuthenticationConverter

Closes gh-11587

oauth2/oauth2-resource-server/src/main/java/org/springframework/security/oauth2/server/resource/authentication/JwtAuthenticationConverter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2022 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -40,26 +40,12 @@ public class JwtAuthenticationConverter implements Converter<Jwt, AbstractAuthen
 
 	@Override
 	public final AbstractAuthenticationToken convert(Jwt jwt) {
-		Collection<GrantedAuthority> authorities = extractAuthorities(jwt);
+		Collection<GrantedAuthority> authorities = this.jwtGrantedAuthoritiesConverter.convert(jwt);
 
 		String principalClaimValue = jwt.getClaimAsString(this.principalClaimName);
 		return new JwtAuthenticationToken(jwt, authorities, principalClaimValue);
 	}
 
-	/**
-	 * Extracts the {@link GrantedAuthority}s from scope attributes typically found in a
-	 * {@link Jwt}
-	 * @param jwt The token
-	 * @return The collection of {@link GrantedAuthority}s found on the token
-	 * @deprecated Since 5.2. Use your own custom converter instead
-	 * @see JwtGrantedAuthoritiesConverter
-	 * @see #setJwtGrantedAuthoritiesConverter(Converter)
-	 */
-	@Deprecated
-	protected Collection<GrantedAuthority> extractAuthorities(Jwt jwt) {
-		return this.jwtGrantedAuthoritiesConverter.convert(jwt);
-	}
-
 	/**
 	 * Sets the {@link Converter Converter&lt;Jwt, Collection&lt;GrantedAuthority&gt;&gt;}
 	 * to use. Defaults to {@link JwtGrantedAuthoritiesConverter}.