Bumps to latest Node version as supported by @rules_nodejs.

The currently used `@rules_nodejs` dependency [supports up to Node v18.12.1](https://github.com/bazelbuild/rules_nodejs/blob/9ebbd867c123bea5853be7c1922669976fd2b579/nodejs/private/node_versions.bzl#L2211-L2218). We're only one patch behind on `@rules_nodejs`, so this is effectively the latest supported version of `@aspect_rules_js`. Node itself is currently at v18.14.1, so we're a little behind there, but not too bad.

Also updated the `engines` field and widened it to support the current major.

.nvmrc

@@ -1 +1 @@
-16.10.0
+18.12.1

package.json

@@ -4,8 +4,9 @@
     "main": "./packages/rules_prerender/index.js",
     "typings": "./packages/rules_prerender/index.d.ts",
     "engines": {
-        "node": "16.10.0",
-        "npm": "7.24.0"
+        "node": "^18.12.1",
+        "npm": "^8.19.1",
+        "pnpm": "^7.27.1"
     },
     "scripts": {
         "bazel": "bazel",