github action "release on tag" gives warnings

[inphobia]

noticed this after this run:
https://github.com/netdisco/netdisco-mibs/actions/runs/8055570837

release_netdisco_mibs
Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2, softprops/action-gh-release@v1. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.


release_netdisco_mibs
The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

@ollyg
since these actions seem to have credentials for some github actions i don't really want to start fiddling with them. hopefully you can get this sorted in 15 minutes of your spare time, or just close the issue should it not be relevant.