Update dependency lightning to >=2.6,<2.7

Author: renovate[bot]

pyproject.toml

@@ -9,7 +9,7 @@ dependencies = [
     "hydra-colorlog>=1.2.0,<2",
     "hydra-core>=1.3.2,<2",
     "hydra-optuna-sweeper>=1.2.0,<2",
-    "lightning>=2.5.0.post0,<2.6",
+    "lightning>=2.6,<2.7",
     "rich>=14,<15",
     "rootutils>=1.0.7,<2",
     "torchmetrics>=1.8,<1.9",