improve esm wildcard expansion

Essentially, this release enables esmock to resolve the following esm export, see #293

{
  "exports": {
    "./*": {
      "require": "./*.js",
      "import": "./*.js"
    }
  }
}

the following is added to the README,

Note: Typescript loaders ts-node 👍 and tsm 👍 are compatible with other loaders, including esmock. swc 👎 and tsx 👎 are demonstrated as incompatible with other loaders, including esmock.

Full list of changes,

• update README with notice about incompatible typescript loaders
• increment resolvewithplus to support more export patterns, see resolvewithplus v2.1.5
• update publish spec job actions, to use checkout@v4 and setup-node@v4
• remove node 16 from test job matrix, eol 2023, Sep 11 #254 esmock can be used with node 16 today, but removing node 16 from your own test pipelines is recommended