Update the CHANGELOG for 6.6.3

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +3.73% :tada:

Comparison is base (96985b9) 69.34% compared to head (32e218d) 73.08%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #643 +/- ## ========================================== + Coverage 69.34% 73.08% +3.73% ========================================== Files 128 127 -1 Lines 27027 21873 -5154 ========================================== - Hits 18742 15985 -2757 + Misses 8285 5888 -2397 ``` | [Flag](https://app.codecov.io/gh/tecnickcom/TCPDF/pull/643/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [php-5.3-ubuntu-latest](https://app.codecov.io/gh/tecnickcom/TCPDF/pull/643/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `?` | | | [php-5.4-ubuntu-latest](https://app.codecov.io/gh/tecnickcom/TCPDF/pull/643/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `?` | | | [php-5.5-ubuntu-latest](https://app.codecov.io/gh/tecnickcom/TCPDF/pull/643/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `?` | | | [php-5.6-ubuntu-latest](https://app.codecov.io/gh/tecnickcom/TCPDF/pull/643/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `?` | | | [php-7.0-ubuntu-latest](https://app.codecov.io/gh/tecnickcom/TCPDF/pull/643/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `?` | | | [php-7.1-ubuntu-latest](https://app.codecov.io/gh/tecnickcom/TCPDF/pull/643/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `73.07% <ø> (?)` | | | [php-7.2-ubuntu-latest](https://app.codecov.io/gh/tecnickcom/TCPDF/pull/643/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `72.96% <ø> (ø)` | | | [php-7.4-ubuntu-latest](https://app.codecov.io/gh/tecnickcom/TCPDF/pull/643/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `?` | | | [php-8.1-ubuntu-latest](https://app.codecov.io/gh/tecnickcom/TCPDF/pull/643/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | `?` | | 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=None#carryforward-flags-in-the-pull-request-comment) to find out more. [see 82 files with indirect coverage changes](https://app.codecov.io/gh/tecnickcom/TCPDF/pull/643/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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