Update CI dependencies to v1.6.21 (3.28-gdal3.7) (patch)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence	Update
c2cciutils	==1.6.20 -> ==1.6.21					patch
camptocamp/c2cciutils	1.6.20 -> 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))

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Configuration

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