Node 20.10.0 Support

[ChristopherJMiller]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• [ ] The toolchain has been rebuilt successfully (or no changes were made to it)
• [ ] The toolchain/worker package manifests are up-to-date
• [ ] Any updated packages successfully build (or no packages were changed)
• [ ] Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• [ ] Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• [x] All package sources are available
• [ ] cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• [ ] LICENSE-MAP files are up-to-date (./SPECS/LICENSES-AND-NOTICES/data/licenses.json, ./SPECS/LICENSES-AND-NOTICES/LICENSES-MAP.md, ./SPECS/LICENSES-AND-NOTICES/LICENSE-EXCEPTIONS.PHOTON)
• [x] All source files have up-to-date hashes in the *.signatures.json files
• [ ] sudo make go-tidy-all and sudo make go-test-coverage pass
• [x] Documentation has been updated to match any changes to the build system
• [ ] Ready to merge

---

Summary

What does the PR accomplish, why was it needed?

This PR adds support for a nodejs 20.10.0 LTS container

There has been an ask for this since at least July according to #5836, and I also have a need for it internally, so happy to take up the work to get this in :)

Change Log

• Added nodejs20.spec, based on the node 18 spec file
• Added accompanying signatures file, based off the signature [provided by the nodejs org](https://nodejs.org/dist/v20.10.0/SHASUMS256.txt.asc

Does this affect the toolchain?

NO

Associated issues

• #5836

Test Methodology

• Pipeline build id: TBD (going to wait on pipeline build and update this)

[Redent0r]

FYI this package upgrade has been merged to 3.0-dev https://github.com/microsoft/CBL-Mariner/pull/7498. Thanks!

[Meir017-msft]

is this going to be merged into mariner v2 as well?