chore: update linopy requirement from <0.8,>=0.5.1 to >=0.5.1,<0.9

Updates the requirements on [linopy](https://github.com/PyPSA/linopy) to permit the latest version.
- [Release notes](https://github.com/PyPSA/linopy/releases)
- [Changelog](https://github.com/PyPSA/linopy/blob/master/doc/release_notes.rst)
- [Commits](PyPSA/linopy@v0.5.1...v0.8.0)

---
updated-dependencies:
- dependency-name: linopy
  dependency-version: 0.8.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -36,7 +36,7 @@ dependencies = [
     "pandas >= 2.0.0, < 3",
     "xarray >=2024.2.0, <2026.5", # CalVer: allow through next calendar year
     # Optimization and data handling
-    "linopy >=0.5.1, <0.8", # Widened from patch pin to minor range
+    "linopy >=0.5.1, <0.9", # Widened from patch pin to minor range
     "netcdf4 >=1.6.1, <1.7.5",  # 1.7.4 missing wheels, revert to < 2 later
     # Utilities
     "pyyaml >= 6.0.0, < 7",