build(deps): update dython requirement from ~=0.7.6 to ~=0.7.7 in /re…

…quirements (Lightning-AI#2748)

* build(deps): update dython requirement in /requirements

Updates the requirements on [dython](https://github.com/shakedzy/dython) to permit the latest version.
- [Release notes](https://github.com/shakedzy/dython/releases)
- [Changelog](https://github.com/shakedzy/dython/blob/master/CHANGELOG.md)
- [Commits](shakedzy/dython@v.0.7.6...v0.7.7)

---
updated-dependencies:
- dependency-name: dython
  dependency-type: direct:production
...

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

* py3.8

---------

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

requirements/nominal_test.txt

@@ -2,6 +2,7 @@
 # in case you want to preserve/enforce restrictions on the latest compatible version, add "strict" as an in-line comment
 
 pandas >1.4.0, <=2.2.2 # cannot pin version due to numpy version incompatibility
-dython ~=0.7.6
+dython ==0.7.6 ; python_version <"3.9"
+dython ~=0.7.7 ; python_version > "3.8" # we do not use `> =`
 scipy >1.0.0, <1.15.0 # cannot pin version due to some version conflicts with `oldest` CI configuration
 statsmodels >0.13.5, <0.15.0