fix: Update frontend-platform to version 8.3.8

[obscherler]

Description

Update frontend-platform to version 8.3.8 in the teak-design-tokens branch to incorporate the following two fixes that affect theming:

8.3.7: Simplify the logic for Paragon fallbackThemeUrl to always rely on window.location?.origin;
8.3.8: Allow the creation of URLs with only brandOverride definition.

How Has This Been Tested?

Theme the MFE with the following config:

MFE_CONFIG["PARAGON_THEME_URLS"] = {
    "core": {
        "urls": {
            "brandOverride": "http://local.edly.io:3000/core.min.css"
        },
    },
    "variants": {
        "light": {
            "urls": {
                "brandOverride": "http://local.edly.io:3000/light.min.css"
            },
        },
    },
}

Prior to the fix, it doesn’t load the CSS.

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FYI: @brian-smith-tcril

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (teak-design-tokens@88bf980). Learn more about missing BASE report.

Additional details and impacted files

@@                  Coverage Diff                  @@
##             teak-design-tokens     #825   +/-   ##
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  Coverage                      ?   93.15%           
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  Files                         ?      161           
  Lines                         ?     3402           
  Branches                      ?      914           
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  Hits                          ?     3169           
  Misses                        ?      216           
  Partials                      ?       17           

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