chore(deps): update entsoe-py requirement

Updates the requirements on [entsoe-py](https://github.com/EnergieID/entsoe-py) to permit the latest version.
- [Release notes](https://github.com/EnergieID/entsoe-py/releases)
- [Commits](EnergieID/entsoe-py@V0.6.16...V0.7.8)

---
updated-dependencies:
- dependency-name: entsoe-py
  dependency-version: 0.7.8
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -40,7 +40,7 @@ requires-python = ">= 3.11, < 4"
 dependencies = [
   "click >= 8.1.8, < 9",
   # Stick to a version without a polluting `tests` package: https://github.com/EnergieID/entsoe-py/pull/447
-  "entsoe-py >= 0.6.16, < 0.7.1",
+  "entsoe-py >= 0.6.16, < 0.7.9",
   "frequenz-api-common >= 0.8.1, < 0.9.0",
   "grpcio >= 1.72.1, < 2",
   "frequenz-channels >= 1.6.1, < 2",