Prevent System.Net.Http version conflicts

[adams85]

Describe the purpose of your pull request

The library referenced a specific version of the System.Net.Http assembly (v4.3.4), which could cause version conflict issues in the case of net45 and net461 targets. This PR aims to solve this by changing the reference to the built-in version (v4.0.0), which is shipped as a part of the framework.

Requirement checklist (only if applicable)

• [x] I have covered the applied changes with automated tests.
• [x] I have executed the full automated test set against my changes.
• [x] I have validated my changes against all supported platform versions.
• [x] I have read and accepted the contribution agreement.

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