build(deps): bump invenio-theme from 3.4.1 to 3.4.3

Bumps [invenio-theme](https://github.com/inveniosoftware/invenio-theme) from 3.4.1 to 3.4.3.
- [Release notes](https://github.com/inveniosoftware/invenio-theme/releases)
- [Changelog](https://github.com/inveniosoftware/invenio-theme/blob/master/CHANGES.rst)
- [Commits](inveniosoftware/invenio-theme@v3.4.1...v3.4.3)

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

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

requirements.txt

@@ -15,7 +15,7 @@ invenio-oauthclient==4.0.2
 invenio-pidstore==1.3.1
 invenio-records==2.3.0
 invenio-search[opensearch2]==2.4.1
-invenio-theme==3.4.1
+invenio-theme==3.4.3
 invenio-userprofiles==3.0.0
 python-twitter-v2==0.9.2
 responses==0.25.3