Bump unbound to upstream.

unbound/Dockerfile

 ARG BUILD_FROM
 
-FROM klutchell/unbound:1.20.0 as unbound_context
+FROM klutchell/unbound:1.22.0 as unbound_context
 
 FROM $BUILD_FROM
 

unbound/build.json

 {
   "build_from": {
-    "aarch64": "ghcr.io/home-assistant/aarch64-base:3.19",
-    "amd64": "ghcr.io/home-assistant/amd64-base:3.19",
-    "armhf": "ghcr.io/home-assistant/armhf-base:3.19",
-    "armv7": "ghcr.io/home-assistant/armv7-base:3.19",
-    "i386": "ghcr.io/home-assistant/i386-base:3.19"
+    "aarch64": "ghcr.io/home-assistant/aarch64-base:3.21",
+    "amd64": "ghcr.io/home-assistant/amd64-base:3.21",
+    "armhf": "ghcr.io/home-assistant/armhf-base:3.21",
+    "armv7": "ghcr.io/home-assistant/armv7-base:3.21",
+    "i386": "ghcr.io/home-assistant/i386-base:3.21"
   }
 }

unbound/config.json

 {
   "name": "Unbound",
-  "version": "1.20.0.3",
+  "version": "1.22.0.0",
   "slug": "unbound",
   "url": "https://gitlab.rubend.nl/tools/hassio-addons/-/tree/master/unbound",
   "description": "Unbound is a validating, recursive, caching DNS resolver.",