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Update shoutrrr to v0.21.1 and harden SMTP OAuth2 auth (#905)
shoutrrr v0.21.1 adds Signalgrid, Home Assistant, and XMPP notification services and overhauls the Signal service.
SMTP auth=OAuth2 now sends the access token only over TLS or to localhost, and only to the configured host. Before, an OAuth2 SMTP URL without TLS sent the token in plaintext; now that send fails before the token leaves. The default settings use STARTTLS.