Demonstrate switch from buildSrc/version.properties to gradle/libs.versions.toml to enable dependabot to perform automated upgrade

[cwperks]

Description

Opening this PR in draft to explore what it will take to enable dependabot to perform automated upgrades on the dependency versions listed in buildSrc/version.properties.

This issue came up for discussion on my very first PR on the project: opensearch-project#3772.

Dependabot works on version catalogs: https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#gradle

To test this I pushed to the main branch of my fork and used Dependabot CLI to run dependabot in a dry-run mode where it displays what PRs would be created without actually creating a PR.

To test, I created a sample dependabot configuration like this:

job:
  package-manager: gradle
  allowed-updates:
    - update-type: all
  source:
    provider: github
    repo: cwperks/opensearch
    directory: /

And ran it with ~/go/bin/dependabot update -f ./.github/dependabot_server.yml

See joda update in the output:

updater | +-------------------------------------------------------------------------------------------+
updater | |                            Changes to Dependabot Pull Requests                            |
updater | +---------+---------------------------------------------------------------------------------+
updater | | created | org.apache.ant:ant ( from 1.10.14 to 1.10.15 )                                  |
updater | | created | com.netflix.nebula:gradle-extra-configurations-plugin ( from 10.0.0 to 10.0.1 ) |
updater | | created | com.netflix.nebula:nebula-publishing-plugin ( from 21.0.0 to 21.1.0 )           |
updater | | created | com.netflix.nebula:gradle-info-plugin ( from 12.1.6 to 13.3.0 )                 |
updater | | created | org.apache.rat:apache-rat ( from 0.15 to 0.16.1 )                               |
updater | | created | net.java.dev.jna:jna ( from 5.14.0 to 5.15.0 )                                  |
updater | | created | com.avast.gradle:gradle-docker-compose-plugin ( from 0.17.6 to 0.17.9 )         |
updater | | created | org.apache.maven:maven-model ( from 3.9.6 to 3.9.9 )                            |
updater | | created | com.networknt:json-schema-validator ( from 1.2.0 to 1.5.2 )                     |
updater | | created | org.ajoberstar.grgit:grgit-core ( from 5.2.1 to 5.3.0 )                         |
updater | | created | org.wiremock:wiremock-standalone ( from 3.6.0 to 3.9.1 )                        |
updater | | created | org.spockframework:spock-core ( from 2.3-groovy-3.0 to 2.3-groovy-4.0 )         |
updater | | created | joda-time:joda-time ( from 2.12.7 to 2.13.0 )                                   |
updater | +---------+---------------------------------------------------------------------------------+

Related Issues

Resolves opensearch-project#3782

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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