upgrade vulnerable dependency versions (#1023)

The following dependencies were listed as vulnerable by npm audit:
- @sveltejs/kit: v1.30.3->v1.30.4 due to (low):
  - undici: v5.26.5->v5.28.3 (low)
- vite: v4.5.1 -> v4.5.2 (**high**)

This patch fixes the following vulnerabilities:
- undici: GHSA-3787-6prv-h9w3 (proxy-authorization header...)
- vite: GHSA-c24v-8rfc-w8vw (server.fs.deny bypass...)

Except for svelte-check (fails due to lack of environment), all checks
pass per `npm run all`. Site loads correctly on `npm run dev`.

Signed-off-by: Amy Parker <amy@amyip.net>
Co-authored-by: Ethan Davidson <31261035+EthanThatOneKid@users.noreply.github.com>