ci(gitlab-ci): use Node `16.x` for `pre-commit` in test conversion job

[myii]

PR progress checklist (to be filled in by reviewers)

• [ ] Changes to documentation are appropriate (or tick if not required)
• [ ] Changes to tests are appropriate (or tick if not required)
• [ ] Reviews completed

---

What type of PR is this?

Primary type

• [ ] [build] Changes related to the build system
• [ ] [chore] Changes to the build process or auxiliary tools and libraries such as documentation generation
• [x] [ci] Changes to the continuous integration configuration
• [ ] [feat] A new feature
• [ ] [fix] A bug fix
• [ ] [perf] A code change that improves performance
• [ ] [refactor] A code change that neither fixes a bug nor adds a feature
• [ ] [revert] A change used to revert a previous commit
• [ ] [style] Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc.)

Secondary type

• [ ] [docs] Documentation changes
• [ ] [test] Adding missing or correcting existing tests

Does this PR introduce a BREAKING CHANGE?

No.

Related issues and/or pull requests

Describe the changes you're proposing

The test_conversion job failed during the weekly testing:

• https://gitlab.com/myii/template-formula/-/jobs/2371193438

The stderr being:

/root/.cache/pre-commit/repomigj3p4n/node_env-default/bin/node:
/lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.28' not found
(required by /root/.cache/pre-commit/repomigj3p4n/node_env-default/bin/node)

The following references led to this resolution:

• https://github.com/pre-commit/pre-commit/issues/2351
• https://stackoverflow.com/questions/71939099/bitbucket-pipeline-error-installing-pre-commit-ts-lint

As mentioned there:

a few days ago node 18.x was released and the prebuilt binaries require a relatively-recent version of glibc

Which obviously isn't available on our current Bionic-based dind image, i.e. 'myii/ssf-dind-ruby-bionic:2.7.5-1bbox1'.

While debugging this situation locally, noticed that the use of a relative tmp/... subdirectory was within the template-formula directory itself -- so switched this to using /tmp/... instead.

Pillar / config required to test the proposed changes

Debug log showing how the proposed changes work

Documentation checklist

• [ ] Updated the README (e.g. Available states).
• [ ] Updated pillar.example.

Testing checklist

• [ ] Included in Kitchen (i.e. under state_top).
• [ ] Covered by new/existing tests (e.g. InSpec, Serverspec, etc.).
• [ ] Updated the relevant test pillar.

Additional context

[myii]

Thanks for the prompt review, @dafyddj.

[saltstack-formulas-travis]

:tada: This PR is included in version 5.0.9 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: