Bump vobject from 0.9.6.1 to 0.9.8

Bumps [vobject](https://github.com/py-vobject/vobject) from 0.9.6.1 to 0.9.8.
- [Release notes](https://github.com/py-vobject/vobject/releases)
- [Commits](py-vobject/vobject@0.9.6.1...v0.9.8)

---
updated-dependencies:
- dependency-name: vobject
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -31,7 +31,7 @@ cchardet==2.1.7
 lxml==5.0.0
 olefile==0.47
 Pillow==10.1.0
-vobject==0.9.6.1
+vobject==0.9.8
 msglite==0.30.0
 icalendar==5.0.12