Fix: In scaled environments, the version hash might differ from node to node

Solution: Only use the hash of the version

spec/headers_test.js

@@ -37,7 +37,7 @@ describe('Responses contain custom headers', function () {
   it('index.html has version', async function () {
     const response = await request(app).get('/index.html')
     expect(response.statusCode).to.equal(200)
-    expect(response.headers.version).to.match(/\d*\.\d*/)
+    expect(response.headers.version).to.equal('3038606729')
   })
 
   it('javascript file contains dependencies', async function () {

src/files.js

@@ -76,7 +76,7 @@ class FileCache {
 
     this._cache = cache
     this._manifests = manifests
-    this._hash = `${+new Date()}.${manifests.__hash__}`
+    this._hash = manifests.__hash__
     this._dependencies = deps
     this._oxManifests = viteToOxManifest(manifests)