Bump electron-builder from 26.3.0 to 26.8.1

Bumps [electron-builder](https://github.com/electron-userland/electron-builder/tree/HEAD/packages/electron-builder) from 26.3.0 to 26.8.1.
- [Release notes](https://github.com/electron-userland/electron-builder/releases)
- [Changelog](https://github.com/electron-userland/electron-builder/blob/master/packages/electron-builder/CHANGELOG.md)
- [Commits](https://github.com/electron-userland/electron-builder/commits/electron-builder@26.8.1/packages/electron-builder)

---
updated-dependencies:
- dependency-name: electron-builder
  dependency-version: 26.8.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

packages/desktop/samples/basic/package.json

@@ -22,7 +22,7 @@
     "@stlite/desktop": "workspace:^",
     "cross-env": "^10.1.0",
     "electron": "34.3.0",
-    "electron-builder": "^26.3.0"
+    "electron-builder": "^26.8.1"
   },
   "stlite": {
     "desktop": {

packages/desktop/samples/file-persistence-idbfs/package.json

@@ -22,7 +22,7 @@
     "@stlite/desktop": "workspace:^",
     "cross-env": "^10.1.0",
     "electron": "34.3.0",
-    "electron-builder": "^26.3.0"
+    "electron-builder": "^26.8.1"
   },
   "stlite": {
     "desktop": {

packages/desktop/samples/file-persistence-nodefs/package.json

@@ -22,7 +22,7 @@
     "@stlite/desktop": "workspace:^",
     "cross-env": "^10.1.0",
     "electron": "34.3.0",
-    "electron-builder": "^26.3.0"
+    "electron-builder": "^26.8.1"
   },
   "stlite": {
     "desktop": {