Update to react@19. Closes #1997 (#2056) · CheckerNetwork/desktop@21056df

The Ubuntu-20.04 brownout takes place from 2025-02-01. For more details, see https://github.com/actions/runner-images/issues/11101

Skipping pull request, no labels were defined (env var PR_LABELS is empty or not defined).

Skipping pull request, no labels were defined (env var PR_LABELS is empty or not defined).

Skipping pull request, no labels were defined (env var PR_LABELS is empty or not defined).

Skipping pull request, no labels were defined (env var PR_LABELS is empty or not defined).

Skipping pull request, no labels were defined (env var PR_LABELS is empty or not defined).

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