Bump litgpt from 0.4.11 to 0.5.3

Bumps [litgpt](https://github.com/lightning-AI/litgpt) from 0.4.11 to 0.5.3.
- [Release notes](https://github.com/lightning-AI/litgpt/releases)
- [Commits](Lightning-AI/litgpt@v0.4.11...v0.5.3)

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

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

requirements/notebooks.txt

@@ -2,4 +2,4 @@ ipython[all] ~=8.27.0
 numpy >=1.23.0,<2  # not yet ready for numpy 2
 liger-kernel == 0.3.1
 cuda-python
-litgpt == 0.5.1
+litgpt == 0.5.3

requirements/test.txt

@@ -12,7 +12,7 @@ expecttest ==0.2.1  # for test_ddp.py
 hypothesis ==6.112.2  # for test_ddp.py
 numpy >=1.23.0,<2  # for test_ops.py; not yet ready for numpy 2
 einops  # for test_einops.py
-litgpt==0.4.11  # for the model definition in tests and benchmarks
+litgpt==0.5.3  # for the model definition in tests and benchmarks
 absl-py # thunder/benchmarks/test_benchmark_litgpt.py
 pandas # thunder/benchmarks/test_benchmark_litgpt.py
 xlsxwriter # thunder/benchmarks/test_benchmark_litgpt.py