Updating wget when downloading fbxsdk

[DanielAtt2000]

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Description

When trying to download fbxsdk in Util/BuildTools/BuildUtilsDocker.sh a 403 forbidden error was being raised. This was resolved with the following change.

Fixes #

Where has this been tested?

• **Platform(s):Linux 18.04 LTS ...
• **Python version(s):3.6.9 ...
• **Unreal Engine version(s):4.26 ...

Possible Drawbacks

None

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This change is 

[update-docs[bot]]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would update our CHANGELOG.md based on your changes.