Task - Polly: update resources from latest aws polly describe-voices

[moyamartin]

I'm updating this because I needed to make moto work with the Gregory voice which is not included

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.51%. Comparing base (6c68326) to head (77bbcb4). Report is 10 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #8168 +/- ## ======================================= Coverage 94.50% 94.51% ======================================= Files 1150 1150 Lines 99203 99185 -18 ======================================= - Hits 93752 93743 -9 + Misses 5451 5442 -9 ``` | [Flag](https://app.codecov.io/gh/getmoto/moto/pull/8168/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getmoto) | Coverage Δ | | |---|---|---| | [servertests](https://app.codecov.io/gh/getmoto/moto/pull/8168/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getmoto) | `28.78% <ø> (-0.02%)` | :arrow_down: | | [unittests](https://app.codecov.io/gh/getmoto/moto/pull/8168/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getmoto) | `94.48% <ø> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=getmoto#carryforward-flags-in-the-pull-request-comment) to find out more.

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[moyamartin]

Happy to help @bblommers!