[support/4.x] Pin GitHub actions/setup-node to v3.6.0

[colinrotherham]

Rolling back to unblock the release

Workaround for an npm cache path issue throwing the error:

Post job cleanup.
Error: Cache folder paths are not retrieved for npm with cache-dependency-path =

This is because our "warm" test runs have node_modules cached already so we configure actions/setup-node to skip cache restoration for the npm get cache directory as we don't need it (and it's slow to restore on Windows):

with:
  cache: ${{ inputs.use-cache != 'false' && 'npm' || '' }}
  node-version-file: .nvmrc

This tip was documented in Usage:

# Used to specify a package manager for caching in the default directory. Supported values: npm, yarn, pnpm.
# Package manager should be pre-installed
# Default: ''
cache: ''

[colinrotherham]

Raised an issue:

• Error using default cache: '' option since v3.7.0 actions/setup-node#797