fix(modules): fix cosmosdb failure (#827)

The mongodb image was expired, [looks like it's support is now included
on
latest](Azure/azure-cosmos-db-emulator-docker#112)
so aligning it with the other DBs types under cosmosdb

Author: terry-docker

modules/cosmosdb/testcontainers/cosmosdb/mongodb.py

@@ -27,7 +27,7 @@ def __init__(
         self,
         mongodb_version: str,
         image: str = os.getenv(
-            "AZURE_COSMOS_EMULATOR_IMAGE", "mcr.microsoft.com/cosmosdb/linux/azure-cosmos-emulator:mongodb"
+            "AZURE_COSMOS_EMULATOR_IMAGE", "mcr.microsoft.com/cosmosdb/linux/azure-cosmos-emulator:latest"
         ),
         **other_kwargs,
     ):