RFR: 7000: Update third party library used in flightrecorder.flameview [v3]

[Marcus Hirt]

On Sun, 20 Dec 2020 22:12:07 GMT, Guru Hb <ghb at openjdk.org> wrote:

>> Updated below listed third party library used in flameview 
>> 1. d3.js (v6.3.1) : Updated Copyright notice in THIRDPARTYREADME.txt from https://raw.githubusercontent.com/d3/d3/master/LICENSE
>> 2. d3-flamegraph (v4.0.6) 
>> 3. d3-flamegraph-tooltip (v4.0.6) : Replaced d3-tip which is currently archived.
>> 
>> Note: minified version (2) and (3) doesn't render Flameview as expected, Tried debugging in Chrome with page.templated formatted and got console error "Uncaught TypeError: Cannot read property 'defaultFlamegraphTooltip' of undefined ... "
>> 
>> Tested on Windows, Mac OS and Ubuntu.
>
> Guru Hb has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fixed Unit test failure

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/186