root: upgrade to openapi generator v6

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

scripts/web_api_esm.py

@@ -1,25 +0,0 @@
-"""Enable ESM Modules for generated Web API"""
-from json import loads, dumps
-
-TSCONFIG_ESM = {
-    "compilerOptions": {
-        "declaration": True,
-        "target": "es6",
-        "module": "esnext",
-        "moduleResolution": "node",
-        "outDir": "./dist/esm",
-        "typeRoots": ["node_modules/@types"],
-    },
-    "exclude": ["dist", "node_modules"],
-}
-
-
-with open("web-api/package.json", encoding="utf-8") as _package:
-    package = loads(_package.read())
-    package["license"] = "GPL-3.0-only"
-    package["module"] = "./dist/esm/index.js"
-    package["sideEffects"] = False
-    package["scripts"]["build"] = "tsc && tsc --project tsconfig.esm.json"
-
-open("web-api/package.json", "w+", encoding="utf-8").write(dumps(package))
-open("web-api/tsconfig.esm.json", "w+", encoding="utf-8").write(dumps(TSCONFIG_ESM))