fix(setup-node): cannot install npm into system folder

[griest024]

fixes https://github.com/graycoreio/daffodil/actions/runs/26543349095/job/78189721589?pr=4452:

Run npx npm -g i npm@11
npm error code EACCES
npm error syscall mkdir
npm error path /usr/local/share/man/man7
npm error errno -13
npm error Error: EACCES: permission denied, mkdir '/usr/local/share/man/man7'
npm error     at async mkdir (node:internal/fs/promises:858:10)
npm error     at async Promise.all (index 0)
npm error     at async Promise.all (index 1)
npm error     at async #createBinLinks (/usr/local/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/rebuild.js:402:5)
npm error     at async Promise.allSettled (index 0)
npm error     at async #linkAllBins (/usr/local/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/rebuild.js:376:5)
npm error     at async #build (/usr/local/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/rebuild.js:161:7)
npm error     at async Arborist.rebuild (/usr/local/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/rebuild.js:63:5)
npm error     at async [reifyPackages] (/usr/local/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/reify.js:334:11)
npm error     at async Arborist.reify (/usr/local/lib/node_modules/npm/node_modules/@npmcli/arborist/lib/arborist/reify.js:149:5) {
npm error   errno: -13,
npm error   code: 'EACCES',
npm error   syscall: 'mkdir',
npm error   path: '/usr/local/share/man/man7'
npm error }

Another potential fix is to use a version manager to install node but that seems less desirable for CI: https://docs.npmjs.com/resolving-eacces-permissions-errors-when-installing-packages-globally

[damienwebdev]

lgtm