Update dependency ngx-highlightjs to v12

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ngx-highlightjs	^10.0.0 -> ^12.0.0

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Release Notes

murhafsousli/ngx-highlightjs (ngx-highlightjs)

v12.0.0

Compare Source

• Upgrade to Angular 18, closes #​286.

v11.0.1

Compare Source

• fix: highlight.js dependency was removed in v11, closes #​283.

v11.0.0

Compare Source

• Update to Angular 17.
• feat: Add provideHighlightOptions function to easily override the default options.
• feat: Add provideGistOptions function in the plus package to easily set gist id and secret into the HTTP requests.
• feat: Add startFrom and singleLine inputs to lineNumbers directive, closes #​274.
• feat: Make codeFromUrl pipe supports loading of relative URLs, closes #​224.
• feat: Add highlight directive which uses a different function and provide different options, closes #​275.
• feat: Add lineNumbersOptions property to set the default line number options.
• refactor: Rename the previous highlight directive to highlightAuto.
• refactor: split line numbers functionality into its own directive.
• refactor: Use highlight.js original interfaces.
• enhance: Allow loading theme from global options if highlight.js was imported externally.

Breaking changes

• The highlight directive now uses a different function from highlight.js which requires selecting a language.
• The highlightAuto directive automatically detects the language and highlights the code.

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