chore(deps): bump workbox-precaching from 7.3.0 to 7.4.0

Bumps [workbox-precaching](https://github.com/googlechrome/workbox) from 7.3.0 to 7.4.0.
- [Release notes](https://github.com/googlechrome/workbox/releases)
- [Commits](GoogleChrome/workbox@v7.3.0...v7.4.0)

---
updated-dependencies:
- dependency-name: workbox-precaching
  dependency-version: 7.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -103,7 +103,7 @@
     "vuetify": "^1.5.24",
     "vuex": "^3.0.1",
     "workbox-core": "^7.4.0",
-    "workbox-precaching": "^7.3.0",
+    "workbox-precaching": "^7.4.0",
     "workbox-routing": "^7.3.0",
     "workbox-strategies": "^7.3.0",
     "workbox-window": "^7.3.0"