Migrate action runtime from Node.js 20 to Node.js 24

[vkumbha]

Summary

• Updates action.yml to use node22 runtime (was node20, which is deprecated)
• Updates check-dist.yml to build with Node.js 22.x to stay in sync

Closes #158

Test plan

• Verify check-dist workflow passes on this PR
• Verify units-test workflow passes
• Confirm no deprecation warnings appear in workflow runs after merge

🤖 Generated with Claude Code

[vkumbha]

Local test results

Run on Node.js v22.22.2 (closest available; CI will validate on Node.js 24):

PASS ./installer.test.js
  checkPlatform
    ✓ works on linux/x64
    ✓ works on linux/arm64
    ✓ don't work on linux/arm
    ✓ don't work on linux/ia32
    ✓ don't work on linux/mips
    ✓ don't work on linux/mipsel
    ✓ don't work on linux/ppc
    ✓ don't work on linux/ppc64
    ✓ don't work on linux/s390
    ✓ don't work on linux/s390x
    ✓ works on darwin/x64
    ✓ works on darwin/arm64
    ✓ don't work on darwin/arm
    ✓ don't work on darwin/ia32
    ✓ don't work on darwin/mips
    ✓ don't work on darwin/mipsel
    ✓ don't work on darwin/ppc
    ✓ don't work on darwin/ppc64
    ✓ don't work on darwin/s390
    ✓ don't work on darwin/s390x
    ✓ don't work on aix/x64
    ✓ don't work on aix/arm64
    ✓ don't work on freebsd/x64
    ✓ don't work on freebsd/arm64
    ✓ don't work on openbsd/x64
    ✓ don't work on openbsd/arm64
    ✓ don't work on sunos/x64
    ✓ don't work on sunos/arm64
    ✓ don't work on win32/x64
    ✓ don't work on win32/arm64
  getVersionFromSpec
    ✓ returns the version
  installSteampipePlugins
    ✓ install the specified plugins without --progress=false
    ✓ install the specified plugins with --progress=false
    ✓ install nothing with undefined
    ✓ install nothing with empty plugins
  configureSteampipePlugins
    ✓ configure the plugins
  getSteampipePluginConfig
    ✓ returns the config for the plugin
    ✓ returns multiple connections per plugin
    ✓ returns config for third party plugins
    ✓ returns config for plugins with specific version

Test Suites: 1 passed, 1 total
Tests:       40 passed, 40 total
Snapshots:   0 total
Time:        0.257 s