chore(table): add z-index to header when sticky

[Barsnes]

resolves #2758

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🦋 Changeset detected

Latest commit: 7b4229002021655902c3803d49ef8a6752c2a5d6

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 4 packages

| Name | Type | | ---------------------------- | ----- | | @digdir/designsystemet-css | Patch | | @digdir/designsystemet | Patch | | @digdir/designsystemet-theme | Patch | | @digdir/designsystemet-react | Patch |

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[github-actions[bot]]

Preview deployments for this pull request:

Storybook - 11. Nov 2024 - 08:43

[github-actions[bot]]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	53.9%	3067 / 5690
🔵	Statements	53.9%	3067 / 5690
🔵	Functions	85.85%	170 / 198
🔵	Branches	74.75%	459 / 614

File Coverage

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