Bump actions versions due to Node 12 deprecation

[bskinn]

Warning from GH Actions:

build 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: conda-incubator/setup-miniconda, JamesIves/github-pages-deploy-action, conda-incubator/setup-miniconda

Bump versions (or find new Actions, if these haven't been updated to Node 16):

• [ ] conda-incubator/setup-miniconda (2 occurrences)
• [ ] JamesIves/github-pages-deploy-action