stop using node 16 in pipelines / clear other pipeline warnings

[Burnett2k]

Description

As directed by Cb, we're no longer supporting node16, and will likely not use node matrixes anymore to build / test various node versions.

This pr removes usage of node 16 and matrix, as well as works to clean up some warnings due to using older versions of Github actions such as setup-node and actions/cache etc.

Fixes #1322 & #1323

ci.yml

Before updating ci.yml (lots of warnings):

After updating ci.yml (no warnings):

create-spectacle.yml

before:

after:

release.yml

before:

after:

release isn't ran until a merge / push is made to master, so I cannot obtain a screenshot of the results without doing some trickery. If needed I can do so, but the changes are essentially the same as the other two files, so seems probably unnecessary.

Type of Change

• Chore / tech debt cleanup

How Has This Been Tested?

1. I verified in the pipelines that the pnpm cache path is still retrieved and set correctly, and warnings were removed
2. I built and ran all the sample applications locally

Checklist: (Feel free to delete this section upon completion)

• I have included a changeset if this change will require a version change to one of the packages.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have run pnpm run check:ci and all checks pass
• My changes generate no new warnings

[changeset-bot]

⚠️ No Changeset found

Latest commit: 15158c6

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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