Bump fava from 1.26.3 to 1.26.4

Bumps [fava](https://github.com/beancount/fava) from 1.26.3 to 1.26.4.
- [Changelog](https://github.com/beancount/fava/blob/main/CHANGES)
- [Commits](beancount/fava@v1.26.3...v1.26.4)

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

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

requirements.txt

@@ -1,4 +1,4 @@
-fava==1.26.3
+fava==1.26.4
 tariochbctools==0.32.0
 smart-importer==0.4
 beancount-reds-plugins==0.3.0