Handle jobs.*.outputs literals gracefully

[woodruffw]

This fixes the first part of #2218, but reveals a much more surprising bug:

 INFO zizmor: 🌈 zizmor v1.28.0
fatal: no audit was performed
error: failed to load https://github.com/AOMediaCodec/avm/blob/HEAD/.github/workflows/pull_request.yaml as workflow
  |
  = help: this typically indicates a bug in zizmor; please report it
  = help: https://github.com/zizmorcore/zizmor/issues/new?template=bug-report.yml

Caused by:
    0: failed to load https://github.com/AOMediaCodec/avm/blob/HEAD/.github/workflows/pull_request.yaml as workflow
    1: failed to load internal pathing document
    2: input is not valid YAML

That suggests a yamlpath or tree-sitter-yaml bug, probably the latter.

[woodruffw]

Ah, that looks like another variant of #1116 -- this was fixed by tree-sitter-grammars/tree-sitter-yaml#36 but hasn't been put into a tree-sitter-yaml release yet.