test: run tests on Mastodon v4

[nolanlawson]

No description provided.

[nolanlawson]

Since Mastodon 3.6, filters can contain multiple keywords and are matched server-side.

This is probably why the filter tests are busted. I'm using the old v1/ filtering API:

pinafore/src/routes/_api/filters.js

Lines 14 to 17 in a3f4191

	export function updateFilter (instanceName, accessToken, filter) {
	const url = `${basename(instanceName)}/api/v1/filters/${filter.id}`
	return put(url, filter, auth(accessToken), { timeout: WRITE_TIMEOUT })
	}

There is also some client-side filtering; not sure how much Mastodon v3.6+ can do for us instead.

Also not sure how to support Mastodon v3.6+ plus older versions and other servers like Pleroma and Misskey. Might need some feature detection that falls back to client-side filtering.

[nolanlawson]

OK so apparently the test failure is caused by a true Mastodon v4 bug: mastodon/mastodon#21965

Probably the long-term fix is #2265. For now we can just disable the test.