Fix: React compiler error on button.

[jorgefilipecosta]

Fixes a react compiler error on the button component.
Fixes the following error:

[2] /home/runner/work/gutenberg/gutenberg/packages/components/src/button/index.tsx
[2]   184:4  error  Mutating a value returned from a function whose return value should not be mutated  react-compiler/react-compiler
[2] 

Part of the work required to have React compiler on the codebase.
See #61788.

Testing Instructions

I staged my changes on #61788 and verified the error disappeared.

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Co-authored-by: jorgefilipecosta <jorgefilipecosta@git.wordpress.org>

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