Fix cl deprecation warning

[tancnle]

This commit replaces clwith cl-lib to remove deprecation warning on Emacs 27 and onward (see deprecation note).

Steps to reproduce

• Install typescript
• Run Emacs v27 (e.g. 27.2)
• Observe the deprecation warning

Package cl is deprecated

[josteink]

Hey there and thanks for the patch!

Change looks harmless enough. If the CI says it’s ok, I guess this is good to merge 🙂