Use TFLINT_LOG instead of --loglevel cli argument and using fixed tflint version

[melihc1]

Link related issues:

• Resolves # (if merging this resolves the issue)
• Progress towards #184 (if it's incremental progress)

Changes/added features:

• Using TFLINT_LOG environment variable with tflint instead of removed --loglevel cli argument (See related PR in tflint repo: https://github.com/terraform-linters/tflint/pull/1470)

Error log:

Failed to parse CLI options; `loglevel` option was removed in v0.40.0. Please set `TFLINT_LOG` environment variables instead

The following short checklist should be used to make sure your PR is of good quality, and can be merged easily:

• [x] follows project conventions
• [x] follows project principles
• [x] ./run.sh works correctly for all new examples
• [ ] CI checks pass
• [x] mergeable to main (no conflicts)
• [x] resolved issues linked
• [x] Milestone linked (if applicable)

Reviewers: @ianmiell @ttarczynski @sanyer @teszes @choilmto @rodrigorras

[melihc1]

/test