fix: fix dev container failing to build (#21218)

The dev container fails to build because of the outdated docker-in-docker feature. This updates the docker-in-docker and fixes the build. I also updated the docker compose references in the docs.

Author: aminya

.devcontainer/devcontainer.json

@@ -11,10 +11,9 @@
     },
     "ghcr.io/devcontainers/features/rust:1": {},
     "ghcr.io/snebjorn/devcontainer-feature/chromium:latest": {},
-    "docker-in-docker": {
+    "ghcr.io/devcontainers/features/docker-in-docker:2": {
       "version": "latest",
-      "moby": true,
-      "dockerDashComposeVersion": "v1"
+      "moby": true
     }
   },
   // Configure tool-specific properties.

modules/openapi-generator/src/main/resources/python-fastapi/README.mustache

@@ -29,7 +29,7 @@ and open your browser at `http://localhost:{{serverPort}}/docs/` to see the docs
 To run the server on a Docker container, please execute the following from the root directory:
 
 ```bash
-docker-compose up --build
+docker compose up --build
 ```
 
 ## Tests

samples/server/petstore/python-fastapi/README.md

@@ -26,7 +26,7 @@ and open your browser at `http://localhost:8080/docs/` to see the docs.
 To run the server on a Docker container, please execute the following from the root directory:
 
 ```bash
-docker-compose up --build
+docker compose up --build
 ```
 
 ## Tests