Update docker.io/eclipse-mosquitto Docker tag to v2.0.21

Update docker.io/eclipse-mosquitto Docker tag to v2.0.21
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No problems deploying Eclipse Mosquitto patch version to Proxmox VE K3s Kubernetes cluster via Flux V2 image reconciliation in a GitOps approach with dependency update facilitated by Mend's Renovate Bot.

This MR contains the following updates:

Package Update Change
docker.io/eclipse-mosquitto patch 2.0.20 -> 2.0.21

Release Notes

eclipse/mosquitto (docker.io/eclipse-mosquitto)

v2.0.21

Compare Source

===================

Security:

  • Fix leak on malicious SUBSCRIBE by authenticated client.
    Closes eclipse #​248.
  • Further fix for CVE-2023-28366.

Broker:

  • Fix clients sending a RESERVED packet not being quickly disconnected.
    Closes #​2325.
  • Fix bind_interface producing an error when used with an interface that has
    an IPv6 link-local address and no other IPv6 addresses. Closes #​2696.
  • Fix mismatched wrapped/unwrapped memory alloc/free in properties. Closes #​3192.
  • Fix allow_anonymous false not being applied in local only mode. Closes #​3198.
  • Add retain_expiry_interval option to fix expired retained message not
    being removed from memory if they are not subscribed to. Closes #​3221.
  • Produce an error if invalid combinations of cafile/capath/certfile/keyfile
    are used. Closes #​1836. Closes #​3130.
  • Backport keepalive checking from develop to fix problems in current
    implementation. Closes #​3138.

Client library:

  • Fix potential deadlock in mosquitto_sub if -W is used. Closes #​3175.

Apps:

  • mosquitto_ctrl dynsec now also allows -i to specify a clientid as well as
    -c. This matches the documentation which states -i. Closes #​3219.
    Client library:
  • Fix threads linking on Windows for static libmosquitto library
    Closes #​3143

Build:

  • Fix Windows builds not having websockets enabled.
  • Add tzdata to docker images

Tests:

  • Fix 08-ssl-connect-cert-auth-expired and 08-ssl-connect-cert-auth-revoked
    tests when under load. Closes #​3208.

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