fix: resolve fetch is not set error (node20)

[fty4]

Updating to node20 to use latest node version for action.

Adding node-fetch to fix error message:

Error: fetch is not set. Please pass a fetch implementation as new Octokit({ request: { fetch }}). Learn more at https://github.com/octokit/octokit.js/#fetch-missing

Implemented as described in octokit documentation