Update GitHub Workflow Actions to Node16-compatible versions

[bdferris-v2]

Describe the bug

In recent GitHub Workflow action runs (e.g. https://github.com/MobilityData/gtfs-validator/actions/runs/3230591604), GitHub has started producing the following warning:

Node.js 12 actions are deprecated. For more information see:
https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/.
Please update the following actions to use Node.js 16: actions/checkout, gradle/wrapper-validation-action, actions/checkout

Per the link, we need to update actions to Node16 compatible versions. Actions that are affected that I've seen listed so far:

• actions/cache
• actions/checkout
• actions/setup-java
• actions/upload-artifact
• eskatos/gradle-command-action
• gradle/wrapper-validation-action

(maybe it's all of them?)

I think we need to change the action versions in the our workflow config files to fix this.

Steps/Code to Reproduce

Run any GitHub Workflow.

Expected Results

No warnings.

Actual Results

Warnings.

Screenshots

No response

Files used

No response

Validator version

N/A

Operating system

N/A

Java version

No response

Additional notes

No response