Revert "flake.lock: Update"

[katexochen]

Reverts #70

azure-cli is broken on unstable, reverting until the fix (NixOS/nixpkgs#281213) is in:

       last 10 log lines:
       > adding 'azure_mgmt_batch-17.0.0.dist-info/top_level.txt'
       > adding 'azure_mgmt_batch-17.0.0.dist-info/RECORD'
       > removing build/bdist.linux-x86_64/wheel
       > Successfully built azure_mgmt_batch-17.0.0-py3-none-any.whl
       > Finished creating a wheel...
       > Finished executing pypaBuildPhase
       > Running phase: pythonRuntimeDepsCheckHook
       > Executing pythonRuntimeDepsCheck
       > Checking runtime dependencies for azure_mgmt_batch-17.0.0-py3-none-any.whl
       >   - msrest not installed
       For full logs, run 'nix log /nix/store/f4fw4971apvgzy8058zb20frpwmy7kv3-python3.11-azure-mgmt-batch-17.0.0.drv'.

[3u13r]

LGTM