build: bump langium to the latest version

[lars-reimann]

Summary of Changes

Bump Langium to version 2.1.0.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ JSON	eslint-plugin-jsonc	4	0	0	1.85s
✅ JSON	jsonlint	4		0	0.24s
✅ JSON	npm-package-json-lint	yes		no	0.72s
✅ JSON	prettier	4	0	0	1.07s
✅ JSON	v8r	4		0	7.81s
✅ REPOSITORY	git_diff	yes		no	0.1s
✅ TYPESCRIPT	eslint	1	0	0	5.71s
✅ TYPESCRIPT	prettier	1	0	0	0.71s

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[codecov]

Codecov Report

Merging #719 (dfef986) into main (f080d13) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #719   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           73        73           
  Lines         9823      9808   -15     
  Branches      2102      2102           
=========================================
- Hits          9823      9808   -15     

Files	Coverage Δ
...rc/language/lsp/safe-ds-semantic-token-provider.ts	100.00% <100.00%> (ø)