tests ~ increase 'ava' global test timeout

- use global timeout instead of individual test timeouts

# Discussion

Individual test timeouts (`t.timeout(...)`) do *not* increase the global timeout; they
only decrease the timeout. So, they are currently worthless for modifying longer tests.

* ref: <avajs/ava#2384>

package.json

@@ -214,7 +214,7 @@
 		"files": [
 			"!**/*.test-d.ts"
 		],
-		"timeout": "30s",
+		"timeout": "60s",
 		"typescript": {
 			"rewritePaths": {
 				"src/": "build/cjs+tests/"