Try using plutus-1.38 for plutus-preprocessor

[lehins]

Description

This is a test PR. DO NOT MERGE yet

Checklist

• Commits in meaningful sequence and with useful messages
• Tests added or updated when needed
• CHANGELOG.md files updated for packages with externally visible changes
  
  New section is never added with the code changes. (See RELEASING.md)
• Versions updated in .cabal and CHANGELOG.md files when necessary, according to the
  versioning process.
• Version bounds in .cabal files updated when necessary
  
  If you change the bounds in a cabal file, that package itself must have a version increase. (See RELEASING.md)
• Code formatted (use scripts/fourmolize.sh)
• Cabal files formatted (use scripts/cabal-format.sh)
• hie.yaml updated (use scripts/gen-hie.sh)
• Self-reviewed the diff

[lehins]

Surprisingly the issue we've experienced previously with OOM on CI due to plutus-tx-plugin-1.38 is not happening in this PR. However, considering that we had it happen before and it was really getting in a way of development, I'll postpone the update until the test scripts has been fixed to not use so much memory. @zliu41 kindly offered to create a PR that will change our examples to use a much better way of writing scripts that should reduce both the size of the test scripts, as well as amount of RAM it takes to compile them.