chore(ci): upgrade checkout and setup-node actions to v4

[mdryaan]

Problem

.github/workflows/documentation.yaml uses actions/checkout@v1 and actions/setup-node@v1. v1 of both actions is deprecated and has security warnings. Current versions are actions/checkout@v4 and actions/setup-node@v4.

Fixes

• Upgrade actions/checkout@v1 → actions/checkout@v4 in both checks and gh-release jobs
• Upgrade actions/setup-node@v1 → actions/setup-node@v4 in both jobs
• Upgrade webfactory/ssh-agent@v0.5.0 → webfactory/ssh-agent@v0.9.0 in gh-release job

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[mdryaan]

Hey @ZiMengSheng @zwzhang0107 , Could you please have a look at this PR whenever you have time? Thanks!
Also some other small fixes i did #330, #331, #333