Changed dep.protobuf.version to dep.protobuf-bom.version

[jayhomn-bitquill]

The dep.protobuf.version variable was used in this fork https://github.com/rafael-telles/arrow/tree/flight-jdbc-driver where it was referencing variables in the parent pom that does not exist in the official arrow fork of flight-sql-jdbc which this branch is based off of. This caused a build issue where dep.protobuf.version is not defined. Changing it to dep.protobuf-bom.version fixes the build issue

[github-actions]

Thanks for opening a pull request!

If this is not a minor PR. Could you open an issue for this pull request on JIRA? https://issues.apache.org/jira/browse/ARROW

Opening JIRAs ahead of time contributes to the Openness of the Apache Arrow project.

Then could you also rename pull request title in the following format?

ARROW-${JIRA_ID}: [${COMPONENT}] ${SUMMARY}

or

MINOR: [${COMPONENT}] ${SUMMARY}

See also:

• Other pull requests
• Contribution Guidelines - How to contribute patches