fix: allow null values for user variable in snippets class

See merge request !30

This commit does the following:
- Updates the installed version of phpstan from 1.10.67 to 1.11.8
- Updates the installed version of phpcs from 3.9.2 to 3.10.1
- Updates the installed version of phpcbf from 3.9.2 to 3.10.1
- Maintains the installed version of phpunit at ^10.5.20
- Updates the installed version of captainhook from 5.23.0 to 5.23.3

Updated the .gitlab-ci.yml file to allow PHPUnit to run on PHP 8.1, 8.2, and 8.3 in the pipeline by
removing their corresponding blocks.
Also, modified the captainhook.json file - removed 'bootstrap' configuration and adjusted
indentation.

Allowed the User variable to accept `null` values in the HtmlSnippets classes' `Snippets` and
`delete` methods. Previously, only User objects were allowed, which could result in errors if no
User was provided. Now, these errors should be avoided.

fix: event dropdown does not open

See merge request !29

related: #3

Release

See merge request !28

fix: rework snippet decoding

See merge request !27

The snippet decoding did not work with "script" tags.
The "script" tags produced invalid HTML.
The invalid HTML could then not be added to the DOM properly.

Co-authored-by: Michael Danielczok <michael@pcsg.de>
Co-authored-by: Moritz Scholz <scholz@pcsg.de>
(cherry picked from commit 06a5867f)

fix: use script text/plain method to insert snippets

See merge request !22

related: #2

Next

See merge request !21

fix: quiqqer/quiqqer locale and paths adapted to quiqqer/core

See merge request !20

feat!: quiqqer v2

See merge request !19

feat!: quiqqer v2

See merge request !18

feat!: quiqqer v2

See merge request !17

BREAKING CHANGE: quiqqer v2 has been renamed to quiqqer/core. a new major version will be created here so that we can still develop for both versions.

Next

See merge request !16

fix: display correct snippet status

See merge request !15

Next

Closes #1

See merge request !14

fix: #1

See merge request !13

Next

See merge request !12

fix: correct logo path

See merge request !11