Update CI dependencies to v1.6.21 (3.28-gdal3.8) (patch)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence	Update
c2cciutils	==1.6.19 -> ==1.6.21					patch
camptocamp/c2cciutils	1.6.19 -> 1.6.21					patch

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Release Notes

camptocamp/c2cciutils (c2cciutils)

### [`v1.6.21`](https://togithub.com/camptocamp/c2cciutils/releases/tag/1.6.21) [Compare Source](https://togithub.com/camptocamp/c2cciutils/compare/1.6.20...1.6.21) ### 1.6.21 (2024-06-04) #### Fixed bugs - [#​1724](https://togithub.com/camptocamp/c2cciutils/issues/1724) Fix spelling ([@​sbrunner](https://togithub.com/sbrunner)) ### [`v1.6.20`](https://togithub.com/camptocamp/c2cciutils/releases/tag/1.6.20) [Compare Source](https://togithub.com/camptocamp/c2cciutils/compare/1.6.19...1.6.20) ##### 1.6.20 (2024-06-03) ##### New feature - [#​1722](https://togithub.com/camptocamp/c2cciutils/issues/1722) Publishing: Fix then the Security.md file didn't exists ([@​sbrunner](https://togithub.com/sbrunner))

##### Dependency update

- [#​1713](https://togithub.com/camptocamp/c2cciutils/issues/1713) Update dependency camptocamp/c2cciutils to v1.6.19 (1.6) ([@​renovate\[bot\]](https://togithub.com/apps/renovate)) - [#​1712](https://togithub.com/camptocamp/c2cciutils/issues/1712) Update all patch versions (1.6) (patch) ([@​renovate\[bot\]](https://togithub.com/apps/renovate))

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