Release v0.21.0

Update

• Update dify to 0.6.16
• Support AliyunOSS as external storage #74 @denverdino
• Added ssrf_proxy
• Fixed sandbox authentication and overhauled sandbox configuration definition
• Added grpc and timeout configuration in .Values.externalQdrant
• Resolve sandbox compatibility issue by using explicit version tags of langgenius/dify-sandbox instead of latest langgenius/dify#5247
• Explicitly Include Affinity & Toleration Options in PostgresSQL #71 @Shomu-Maersk
• Support pgvector as vector db #79 @FingerLiu
• Fix typo in config.tpl #80 @eltociear

Breaking Change

• Configuration layout and default values of of SMTP for api is now changed
  • Use port 465 instead 587
  • .Values.api.mail.smtp.useTLS no longer takes effect, use .Values.api.mail.smtp.tls.enabled instead.