[2.x] Use version of httpclient 4 from core's buildSrc/version.properties

[cwperks]

Description

This PR solves for the issue in backwards compatibility tests seen in PRs like: #2949

> Task :compileJava FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Could not resolve all dependencies for configuration ':compileClasspath'.
   > Conflict(s) found for the following module(s):
       - org.apache.httpcomponents:httpclient between versions 4.5.14 and 4.5.13
     Run with:
         --scan or
         :dependencyInsight --configuration compileClasspath --dependency org.apache.httpcomponents:httpclient
     to get more insight on how to solve the conflict.

• Category (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation)

Maintenance

Check List

• New functionality includes testing
• New functionality has been documented
• Commits are signed per the DCO using --signoff

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[cwperks]

#2781 needs to be backported to 2.x. I just added a backport 2.x label.

[cwperks]

Manual backport for the core refactor change created: #2953

Should I bundle this change into that PR?

[cwperks]

Closing this PR and incorporating the changes its introducing into this PR: #2953