Fix PageHeader context bar font-weight

[langermank]

Closes https://github.com/github/primer/issues/5382

I took a look at the prev. implementation before CSS Modules and best I can tell we didn't set the weight to light. I'm not sure if this was maybe an oversight?

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Latest commit: 89f6bf2

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size-limit report 📦

Path	Size
packages/react/dist/browser.esm.js	92.48 KB (0%)
packages/react/dist/browser.umd.js	92.7 KB (0%)

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