Update actions/upload-pages-artifact action to v2 (#273)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[actions/upload-pages-artifact](https://togithub.com/actions/upload-pages-artifact)
| action | major | `v1` -> `v2` |

---

### Release Notes

<details>
<summary>actions/upload-pages-artifact
(actions/upload-pages-artifact)</summary>

###
[`v2`](https://togithub.com/actions/upload-pages-artifact/compare/v1...v2)

[Compare
Source](https://togithub.com/actions/upload-pages-artifact/compare/v1...v2)

</details>

---

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are satisfied.

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rebase/retry checkbox.

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---

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.github/workflows/pages.yaml

@@ -45,7 +45,7 @@ jobs:
       - name: Setup Pages
         uses: actions/configure-pages@v3
       - name: Upload artifact
-        uses: actions/upload-pages-artifact@v1
+        uses: actions/upload-pages-artifact@v2
         with:
           # Upload entire repository
           path: 'docs/'