Remove console warnings of deprecated dependencies

[thooyork]

highlight is deprecated:
marked(): highlight and langPrefix parameters are deprecated since version 5.0.0, should not be used and will be removed in the future. Instead use https://www.npmjs.com/package/marked-highlight.

[floscher]

I tried switching to marked-highlight by deleting

fuBlog/common/src/markdown-converter-common.ts

Lines 119 to 121 in 1c23e7b

	highlight: function (code, lang) {
	return highlightjs.highlightAuto(code).value;
	},

in favour of adding

import { markedHighlight } from "marked-highlight";
…
marked.use(
  markedHighlight({
    highlight: function (code, lang) {
      return highlightjs.highlightAuto(code).value;
    },
  }),
);

after this line

fuBlog/common/src/markdown-converter-common.ts

Line 110 in 1c23e7b

marked.use(MarkdownConverter.rendererExtension);

But I always get this error:

 ../node_modules/marked-highlight/src/index.d.ts(68,82): error TS2694: Namespace '"/home/username/path-to-project/node_modules/@types/marked/index"' has no exported member 'MarkedExtension'.
       ../node_modules/marked-highlight/src/index.d.ts(76,83): error TS2694: Namespace '"/home/username/path-to-project/node_modules/@types/marked/index"' has no exported member 'MarkedExtension'.
       ../node_modules/marked-highlight/src/index.d.ts(86,23): error TS2694: Namespace '"/home/username/path-to-project/node_modules/@types/marked/index"' has no exported member 'MarkedExtension'.