26.8.20260811

• SECURITY: this release fixes multiple high level security vulnerabilities, everyone is strongly adviced to update to it!
• Admin: fix TypeError in clearing openid access-tokens on password reset
• Auth: fix TypeError authenticating with OAuth Bearer token / id_token cookie
• Calendar: fix TypeError when importing iCal, one more date not being a DateTime
• Calendar: make sure notifications are in user timezone
• OpenID: diverse fixes / regressions after the update in the last release
• WebAuthN: fixed existing passkeys were not longer working due to missing proxy configuration