fix(tools): issue when converting a valid model to Protobuf

[stefanblaginov]

Closes #617

Author Checklist

• Ensure you provide a DCO sign-off for your commits using the --signoff option of git commit.
• Vital features and changes captured in unit and/or integration tests
• Commits messages follow AP format
• Extend the documentation, if necessary
• Merging to main from fork:branchname

[dselman]

Test is failing due to a CR/LF line feed issue on Windows:

AssertionError: expected 'syntax = "proto3";\n\npackage concert…' to equal 'syntax = "proto3";\r\n\r\npackage con…'

[stefanblaginov]

Test is failing due to a CR/LF line feed issue on Windows:

AssertionError: expected 'syntax = "proto3";\n\npackage concert…' to equal 'syntax = "proto3";\r\n\r\npackage con…'

Thanks @dselman , I had forgotten about that quirk! Addressed ✅