Fix mosquitto image tag: use 2.0.22 instead of nonexistent 2.1.2 (#198)

## Summary
- The `eclipse-mosquitto:2.1.2` tag doesn't exist on Docker Hub — the 2.1.x series only publishes `-alpine` variants
- Corrects the pinned tag to `2.0.22`, the latest non-alpine version (matching what the old floating `:2` tag was resolving to)
- Updates tracking file and changelog fragment accordingly

## Context
The previous PR #197 pinned mosquitto from floating `:2` to `2.1.2`, but the new pod failed with `ErrImagePull` ("manifest unknown"). The old pod is still running on `:2`.

## Test plan
- [ ] Verify `eclipse-mosquitto:2.0.22` pulls successfully
- [ ] Verify mosquitto pod restarts and passes readiness/liveness probes
- [ ] `mise run services-check` passes

Reviewed-on: https://forge.ops.eblu.me/eblume/blumeops/pulls/198

argocd/manifests/mosquitto/deployment.yaml

@@ -16,7 +16,7 @@ spec:
     spec:
       containers:
         - name: mosquitto
-          image: eclipse-mosquitto:2.1.2
+          image: eclipse-mosquitto:2.0.22
           ports:
             - containerPort: 1883
               name: mqtt

docs/changelog.d/service-review-mosquitto-tailscale-operator.infra.md

@@ -1 +1 @@
-First service version review: pin mosquitto to 2.1.2, bump tailscale-operator to v1.94.2, record 7 reviewed services
+First service version review: pin mosquitto to 2.0.22, bump tailscale-operator to v1.94.2, record 7 reviewed services

service-versions.yaml

@@ -35,7 +35,7 @@ services:
   - name: mosquitto
     type: argocd
     last-reviewed: 2026-02-16
-    current-version: "2.1.2"
+    current-version: "2.0.22"
     upstream-source: https://github.com/eclipse/mosquitto/releases
 
   - name: ntfy