Remove dependabot ignores when held-back majors are unblocked

[aleksandrychev]

.github/dependabot.yml ignores four major updates because the toolchain can't take them yet (see PR #9 — the grouped bump broke npm ci and lint):

Ignored	Blocked by	Remove ignore when
vite 8.x	electron-vite@5 peer-depends on vite ^5||^6||^7	electron-vite@6 is stable
@vitejs/plugin-react 6.x	requires vite 8	same as above
eslint 10.x	eslint-plugin-react (via @northern.tech/eslint-config) crashes on eslint 10	eslint-config's plugin stack supports eslint 10
typescript 7.x	ts-api-utils (via eslint-plugin-sonarjs) breaks on the TS 7 native port	typescript-eslint/ts-api-utils support TS 7

To unblock: delete the corresponding ignore entries in .github/dependabot.yml - dependabot will pick the updates up on its next weekly run.