Fix node version mismatch in .nvmrc and package.json.

[c-shultz]

Fixes #230

Description

Node version in package.json is 16.17.1 and .nvmrc was set to LTS which is no longer compatible with package versions. This PR updates the .nvrmc to 16.17.1 to avoid build errors.

How to test this PR

1. Do a fresh clone of repo.
2. Run nvm use
3. Run npm install
4. Run npm run build

Product impact

• Added changelog entry (or does not apply)
• Will this PR affect WooCommerce Subscriptions? yes/no/tbc, add issue ref
• Will this PR affect WooCommerce Payments? yes/no/tbc, add issue ref
• Added deprecated functions, hooks or classes to the spreadsheet

[c-shultz]

I see there is also a now outdated WiP PR to update the packages to Node 18 compatibility: #231

Anything older than Node 18 is now unmaintained. Should an issue be opened to update Node and package versions?

[james-allan]

Changes look good. 👍

I confirmed that the previous nvm version (lts) failed to build, but the build succeeds on this branch using version 16.17.1. Additionally, this version is consistent with the version mentioned in the README.

Thanks @c-shultz.