chore(deps): bump @nuxtjs/pwa from 3.0.0-beta.19 to 3.0.0-beta.20

Bumps [@nuxtjs/pwa](https://github.com/nuxt-community/pwa-module) from 3.0.0-beta.19 to 3.0.0-beta.20.
- [Release notes](https://github.com/nuxt-community/pwa-module/releases)
- [Changelog](https://github.com/nuxt-community/pwa-module/blob/dev/CHANGELOG.md)
- [Commits](https://github.com/nuxt-community/pwa-module/compare/v3.0.0-beta.19...v3.0.0-beta.20)

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

package-lock.json

@@ -1724,11 +1724,11 @@
             }
         },
         "@nuxtjs/pwa": {
-            "version": "3.0.0-beta.19",
-            "resolved": "https://registry.npmjs.org/@nuxtjs/pwa/-/pwa-3.0.0-beta.19.tgz",
-            "integrity": "sha512-5c7CB2qrrlpu7BmJeWX9GN//uK1SiEzBbT+ykH11ZfUxQyXiO3QTm1f6tTOnG/P5v4kRIGYdBr0wmRbA/Hv1cw==",
+            "version": "3.0.0-beta.20",
+            "resolved": "https://registry.npmjs.org/@nuxtjs/pwa/-/pwa-3.0.0-beta.20.tgz",
+            "integrity": "sha512-pZhGBqRvTCItvAdZ6PSZtqJUKT6ybphXCykfHh95KzW0cGf10QH/ETPci2AMDEzfx4jW2hImGSmLBToVWOV7Uw==",
             "requires": {
-                "defu": "^0.0.3",
+                "defu": "^1.0.0",
                 "execa": "^1.0.0",
                 "fs-extra": "^8.1.0",
                 "hasha": "^5.0.0",
@@ -4265,9 +4265,9 @@
             }
         },
         "defu": {
-            "version": "0.0.3",
-            "resolved": "https://registry.npmjs.org/defu/-/defu-0.0.3.tgz",
-            "integrity": "sha512-u/fe4fBwrD0KACvI0sYWTWFzooqONZq8ywPnK0ZkAgLNwaDTKpSWvMiiU4QmzhrQCXu8Y0+HIWP8amE18lsL4A=="
+            "version": "1.0.0",
+            "resolved": "https://registry.npmjs.org/defu/-/defu-1.0.0.tgz",
+            "integrity": "sha512-1Y1KRFxiiq+LYsZ3iP7xYSR8bHfmHFOUpDunZCN1ld1fGfDJWJIvkUBtjl3apnBwPuJtL/H7cwwlLYX8xPkraQ=="
         },
         "delayed-stream": {
             "version": "1.0.0",