text: Title: JWTBearerTokenValidator don't send parameters now and leeway to claim.validate
  Body: 
  
  ```python
  # authlib\oauth2\rfc7523\validator.py
  class JWTBearerTokenValidator:
      def authenticate_token(self, token_string):
          try:
              claims = jwt.decode( ... )
              claims.validate()
              return claims
          except JoseError as error:
             ...
  ```
  
  But:
  
  ```python
  # authlib\jose\rfc7519\claims.py
  class JWTClaims(BaseClaims):
      ...
      def validate(self, now=None, leeway=0):
          ...
  ```
  
  I see the solution in:
  
  ```python
  def authenticate_token(self, token_string, now=None, leeway=0):
          ... 
          claims.validate(now, leeway)
          ...
  ```
  
  The bug appears in testing phase. 