build!: Update to Node v22

[rarkins]

Changes

Updates Dockerfile and Actions to use Node 22

Context

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[rarkins]

# Error: Cannot find module '/home/runner/work/renovate/renovate/tools/docs/test'
#     at Function._resolveFilename (node:internal/modules/cjs/loader:1249:15)
#     at Function._load (node:internal/modules/cjs/loader:1075:27)
#     at TracingChannel.traceSync (node:diagnostics_channel:315:14)
#     at wrapModuleLoad (node:internal/modules/cjs/loader:218:24)
#     at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:170:5)
#     at node:internal/main/run_main_module:[36](https://github.com/renovatebot/renovate/actions/runs/11558770142/job/32171997068?pr=32182#step:7:37):49 {
#   code: 'MODULE_NOT_FOUND',
#   requireStack: []

@viceice do you know what we need to do about the .mjs file in Node v22?

[viceice]

will check later

[viceice]

wrong changes in this pr