fix(ProgressStepper): add className prop

[stephanLeece]

Purpose of PR

Form36 docs listed className as a prop for this component, but it wasn't being passed. I added it.

PR Checklist

• [x] I have read the relevant readme.md file(s)
• [x] All commits follow our Git commit message convention
• [x] Tests are added/updated/not required
• [x] Tests are passing
• [x] Storybook stories are added/updated/not required
• [x] Usage notes are added/updated/not required
• [x] Has been tested based on Contentful's browser support
• [x] Doesn't contain any sensitive information

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: e03543594193b4909ccddaf6573b1baee02a37b2

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

This PR includes changesets to release 36 packages

| Name | Type | | ---------------------------- | ----- | | @contentful/f36-components | Patch | | @contentful/f36-accordion | Patch | | @contentful/f36-asset | Patch | | @contentful/f36-autocomplete | Patch | | @contentful/f36-badge | Patch | | @contentful/f36-button | Patch | | @contentful/f36-card | Patch | | @contentful/f36-collapse | Patch | | @contentful/f36-copybutton | Patch | | @contentful/f36-core | Patch | | @contentful/f36-datetime | Patch | | @contentful/f36-datepicker | Patch | | @contentful/f36-drag-handle | Patch | | @contentful/f36-entity-list | Patch | | @contentful/f36-empty-state | Patch | | @contentful/f36-forms | Patch | | @contentful/f36-icon | Patch | | @contentful/f36-header | Patch | | @contentful/f36-list | Patch | | @contentful/f36-menu | Patch | | @contentful/f36-modal | Patch | | @contentful/f36-navbar | Patch | | @contentful/f36-note | Patch | | @contentful/f36-notification | Patch | | @contentful/f36-pagination | Patch | | @contentful/f36-pill | Patch | | @contentful/f36-popover | Patch | | @contentful/f36-skeleton | Patch | | @contentful/f36-spinner | Patch | | @contentful/f36-table | Patch | | @contentful/f36-tabs | Patch | | @contentful/f36-text-link | Patch | | @contentful/f36-tooltip | Patch | | @contentful/f36-typography | Patch | | @contentful/f36-image | Patch | | @contentful/f36-avatar | Patch |

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Name	Status	Preview	Updated (UTC)
forma-36	🔄 Building (Inspect)	Visit Preview	Sep 25, 2024 1:32pm

[github-actions[bot]]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
CommonJS	112.16 KB (0%)	2.3 s (0%)	92 ms (+26.44% 🔺)	2.4 s
Module	110.78 KB (0%)	2.3 s (0%)	90 ms (+0.69% 🔺)	2.4 s