chore: upgrade c8 to v11.0.0 and improvements test (#564)

Author: Tony133

package.json

@@ -69,7 +69,7 @@
     "@fastify/compress": "^8.0.0",
     "@types/node": "^25.0.3",
     "borp": "^1.0.0",
-    "c8": "^10.1.3",
+    "c8": "^11.0.0",
     "concat-stream": "^2.0.0",
     "eslint": "^9.17.0",
     "fastify": "^5.1.0",

test/static.test.js

@@ -1515,7 +1515,7 @@ test('register no prefix', async (t) => {
   })
 })
 
-test('with fastify-compress', async t => {
+test('with fastify-compress', { timeout: 60000 }, async t => {
   t.plan(2)
 
   const pluginOptions = {
@@ -1529,8 +1529,6 @@ test('with fastify-compress', async t => {
 
   await fastify.listen({ port: 0 })
 
-  fastify.server.unref()
-
   await t.test('deflate', async function (t) {
     t.plan(3 + GENERIC_RESPONSE_CHECK_COUNT)
 
@@ -1555,6 +1553,7 @@ test('with fastify-compress', async t => {
     genericResponseChecks(t, response)
   })
 })
+
 test('register /static/ with schemaHide true', async t => {
   t.plan(2)