Remove support for MongoDB 4.4

Removed integration tests against MongoDB 4.4, updated MongoDB registry
documentation.

.github/workflows/ci.yml

@@ -43,7 +43,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        device-registry-name: [file,jdbc,mongodb-4.4,mongodb-5.0,mongodb-6.0,mongodb-7.0]
+        device-registry-name: [file,jdbc,mongodb-5.0,mongodb-6.0,mongodb-7.0]
         include:
         # Use Quarkus JVM images: file registry, AMQP messaging, Command Router with embedded cache
         - device-registry-name: file
@@ -58,11 +58,6 @@ jobs:
           messaging-type: kafka
           mongodb-image-name: mongo:6.0
         # Use Quarkus JVM images: mongodb registry Kafka messaging, Command Router with data grid
-        - device-registry-name: mongodb-4.4
-          device-registry: mongodb
-          commandrouting-cache: server
-          messaging-type: kafka
-          mongodb-image-name: mongo:4.4
         - device-registry-name: mongodb-5.0
           device-registry: mongodb
           commandrouting-cache: server

site/documentation/content/admin-guide/mongodb-device-registry-config.md

@@ -16,19 +16,12 @@ The registry is implemented as a Quarkus application, using a MongoDB database a
 either directly from the command line or by means of starting the corresponding
 [Docker image](https://hub.docker.com/r/eclipse/hono-service-device-registry-mongodb/) created from it.
 
-The registry is compatible and known to work with following MongoDB versions:
+The registry is compatible and known to work with the following MongoDB versions:
 
-* [MongoDB 4.4](https://www.mongodb.com/docs/v4.4/release-notes/4.4/)
 * [MongoDB 5.0](https://www.mongodb.com/docs/v5.0/release-notes/5.0/)
 * [MongoDB 6.0](https://www.mongodb.com/docs/v6.0/release-notes/6.0/)
 * [MongoDB 7.0](https://www.mongodb.com/docs/v7.0/release-notes/7.0/)
 
-{{% notice warning %}}
-According to the [Mongo DB Software Lifecycle Schedule](https://www.mongodb.com/support-policy/lifecycles) support
-for Mongo DB 4.4 will end Feb 2024. Consequently, support for Mongo 4.4 in Hono has been deprecated and will be removed
-in a future version altogether. Users are encouraged to migrate to Mongo DB 6.0 or later.
-{{% /notice %}}
-
 ## Service Configuration
 
 The following table provides an overview of the configuration variables and corresponding system properties for