chore(deps): update docker.io/mlocati/php-extension-installer docker tag to v2.7.6 (main)

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/mlocati/php-extension-installer	final	minor	2.6.4 -> 2.7.6

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Release Notes

mlocati/docker-php-extension-installer (docker.io/mlocati/php-extension-installer)

v2.7.6

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• Fix installing smbclient on PHP from 7.0 to 7.3 (#​1028)

v2.7.5

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• Simplify patching apt-get for jessie/stretch (#​1025)

v2.7.4

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First version with docker images published as ghcr.io/mlocati/php-extension-installer

v2.7.3

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• Fix installing smbclient on PHP 5.5/5.6 (#​1020)

v2.7.2

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• Add support for swoole 6 (#​1019)

v2.7.1

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Fixed the publish process - see #​1016

v2.7.0

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• Add support for imagick on PHP 8.4 (#​1010)
• Docker images now come with multi-arch support (#​1009)

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