chore: upgrade devalue and svelte (#15339)

closes #<!-- Add the related issue number here. Repeat this line for
each additional issue it closes -->

<!-- Explain the goal of the PR, why it is needed, and what has been
changed to achieve that goal -->

---

### Please don't delete this checklist! Before submitting the PR, please
make sure you do the following:
- [ ] It's really useful if your PR references an issue where it is
discussed ahead of time. In many cases, features are absent for a
reason. For large changes, please create an RFC:
https://github.com/sveltejs/rfcs
- [ ] This message body should clearly illustrate what problems it
solves.
- [ ] Ideally, include a test that fails without this PR but passes with
it.

### Tests
- [ ] Run the tests with `pnpm test` and lint the project with `pnpm
lint` and `pnpm check`

### Changesets
- [ ] If your PR makes a change that should be noted in one or more
packages' changelogs, generate a changeset by running `pnpm changeset`
and following the prompts. Changesets that add features should be
`minor` and those that fix bugs should be `patch`. Please prefix
changeset messages with `feat:`, `fix:`, or `chore:`.

### Edits

- [ ] Please ensure that 'Allow edits from maintainers' is checked. PRs
without this option may be closed.

Author: elliott-with-the-longest-name-on-github

.changeset/new-breads-type.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+chore: upgrade `devalue` and `svelte`

packages/kit/package.json

@@ -23,7 +23,7 @@
 		"@types/cookie": "^0.6.0",
 		"acorn": "^8.14.1",
 		"cookie": "^0.6.0",
-		"devalue": "^5.6.2",
+		"devalue": "^5.6.3",
 		"esm-env": "^1.2.2",
 		"kleur": "^4.1.5",
 		"magic-string": "^0.30.5",