Bump strax from 1.2.3 to 1.3.0 in /extra_requirements (#398)

Bumps [strax](https://github.com/AxFoundation/strax) from 1.2.3 to 1.3.0.
- [Release notes](https://github.com/AxFoundation/strax/releases)
- [Changelog](https://github.com/AxFoundation/strax/blob/master/HISTORY.md)
- [Commits](AxFoundation/strax@v1.2.3...v1.3.0)

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

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

extra_requirements/requirements-tests.txt

@@ -1,4 +1,4 @@
-strax==1.2.3
+strax==1.3.0
 straxen==1.8.3
 epix==0.3.2
 git+https://github.com/XENONnT/ax_env