* fixes for warnings with typst 0.12.0
* update tests for typst 0.12.0
* update github test workflow for typst 0.12
* chore: apply typst updates to test code
* chore: update compiler version in typst.toml
* chore: use the correct preview version in coverletter2
* chore: improve comments in coverletter template
* chore: update test references
* fix: issues with coverletter for typst `0.12.0`
* update test references with typst-test update
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Co-authored-by: Paul Tsouchlos <developer.paul.123@gmail.com>
