ci: Use node v20 for CI (#3992)

.node-version

@@ -1 +1 @@
-v19
+v20

package.json

@@ -30,10 +30,10 @@
   },
   "scripts": {
     "preversion": ". ./resources/checkgit.sh && npm ci --ignore-scripts",
-    "version": "ts-node resources/gen-version.ts && npm test && git add src/version.ts",
+    "version": "node --loader ts-node/esm resources/gen-version.ts && npm test && git add src/version.ts",
     "fuzzonly": "mocha --full-trace src/**/__tests__/**/*-fuzz.ts",
-    "changelog": "ts-node resources/gen-changelog.ts",
-    "benchmark": "ts-node resources/benchmark.ts",
+    "changelog": "node --loader ts-node/esm resources/gen-changelog.ts",
+    "benchmark": "node --loader ts-node/esm resources/benchmark.ts",
     "test": "npm run lint && npm run check && npm run testonly:cover && npm run prettier:check && npm run check:spelling && npm run check:integrations",
     "lint": "eslint --cache --max-warnings 0 --rulesdir resources/eslint-internal-rules/ .",
     "check": "tsc --pretty",
@@ -47,10 +47,10 @@
     "check:integrations": "mocha --full-trace resources/integration-test.ts",
     "serve": "docusaurus serve --dir websiteDist/ --config website/docusaurus.config.cjs",
     "start": "npm run build:website && npm run serve",
-    "build:website": "ts-node resources/build-docusaurus.ts",
-    "build:npm": "ts-node resources/build-npm.ts",
-    "build:deno": "ts-node resources/build-deno.ts",
-    "diff:npm": "ts-node resources/diff-npm-package.ts",
+    "build:website": "node --loader ts-node/esm resources/build-docusaurus.ts",
+    "build:npm": "node --loader ts-node/esm resources/build-npm.ts",
+    "build:deno": "node --loader ts-node/esm resources/build-deno.ts",
+    "diff:npm": "node --loader ts-node/esm resources/diff-npm-package.ts",
     "gitpublish:npm": "bash ./resources/gitpublish.sh npm npmDist",
     "gitpublish:deno": "bash ./resources/gitpublish.sh deno denoDist"
   },