Added dependencies for Grocy and hotfix for PHP<8.0

[Forceu]

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• [x] I have read the contributing guideline and understand that I have made the correct modifications

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Description:

This Pullrequest includes two changes:

• Adding the dependencies intl, json and zlib
• Adding a hotfix to reduce minimum PHP version required by composer to 7.4, as the Grocy author unknowingly set it to 8.0

As soon as the author fixes the problem or this image is updated to PHP 8.0, the sed statements should be removed!

Benefits of this PR and context:

The build succeeds

How Has This Been Tested?

Building and login to application was sucessful.

Source / References:

Problem is acknowledged in https://github.com/grocy/grocy/issues/1537

[Forceu]

Would close issue #46

[LinuxServer-CI]

I am a bot, here are the test results for this PR: https://ci-tests.linuxserver.io/lspipepr/grocy/v3.1.0-pkg-8b4a728d-pr-47/index.html https://ci-tests.linuxserver.io/lspipepr/grocy/v3.1.0-pkg-8b4a728d-pr-47/shellcheck-result.xml

[aptalca]

Thanks for the PR. Can you add a changelog entry to readme-vars.yml as well?

[Forceu]

Thanks for the quick reply, I updated the Readme

[LinuxServer-CI]

I am a bot, here are the test results for this PR: https://ci-tests.linuxserver.io/lspipepr/grocy/v3.1.0-pkg-8b4a728d-pr-47/index.html https://ci-tests.linuxserver.io/lspipepr/grocy/v3.1.0-pkg-8b4a728d-pr-47/shellcheck-result.xml