RFR: 7903397: Update changelog for jtreg 7.1.1 [v2]

[Christian Stein]

On Mon, 13 Feb 2023 23:19:37 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

>> Christian Stein has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fix tag names
>
> CHANGELOG.md line 11:
> 
>> 9: 
>> 10: * Summary reporter getter is now thread-safe.
>> 11:   * [CODETOOLS-7903390](https://bugs.openjdk.org/browse/CODETOOLS-7903390)
> 
> Seems like duplicate entries.

The intention was to document a backport.

As the upcoming `7.2` release will contain all fixes from older releases, I'll remove the duplicate entry.

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PR: https://git.openjdk.org/jtreg/pull/142