chore: Update transitive dependencies

[kebeda]

Fixes #116

Checklist

• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the [Contribution Guide] and my PR follows them.
• I updated my branch with the master branch.
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation about the functionality in the appropriate .md file
• I have added in line documentation to the code I modified

Short description of what this PR does:

The PR updates transitive dependencies used by java-http-client;

• org.apache.httpcomponents:httpcore:4.4.4 is upgraded to 4.4.12
• org.apache.httpcomponents:httpclient:4.5.2 is upgraded to 4.5.10

These are fully backwardly compatible with what was there before.

[SendGridDX]

All committers have signed the CLA.

[kebeda]

Didn't check the last 3 checkboxes on the PR description because,

• The existing tests cover this
• No user-visible changes are in this PR
• There was no code changed, hence no comment needed

[thinkingserious]

Hello @kebeda,

Thanks again for the PR!

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