Bump flexparser from 0.3.1 to 0.4

Bumps [flexparser](https://github.com/hgrecco/flexparser) from 0.3.1 to 0.4.
- [Changelog](https://github.com/hgrecco/flexparser/blob/main/CHANGES)
- [Commits](hgrecco/flexparser@0.3.1...0.4)

---
updated-dependencies:
- dependency-name: flexparser
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -4,7 +4,7 @@ appdirs==1.4.4
     # via pint
 flexcache==0.3
     # via pint
-flexparser==0.3.1
+flexparser==0.4
     # via pint
 h5py==3.12.1
     # via nxmx (pyproject.toml)