Use lower case "list" and "dict" in invariance notes

[JukkaL]

All supported Python versions support list[...] and dict[...].

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

pydantic (https://github.com/pydantic/pydantic)
- pydantic/aliases.py:29: note: "List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ pydantic/aliases.py:29: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance

prefect (https://github.com/PrefectHQ/prefect)
- src/prefect/utilities/callables.py:571: note: "List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ src/prefect/utilities/callables.py:571: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
- src/prefect/_experimental/lineage.py:261: note: "Dict" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ src/prefect/_experimental/lineage.py:261: note: "dict" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance

streamlit (https://github.com/streamlit/streamlit)
- lib/tests/streamlit/runtime/runtime_test_case.py:86:27: note: "Dict" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ lib/tests/streamlit/runtime/runtime_test_case.py:86:27: note: "dict" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance

rclip (https://github.com/yurijmikhalevich/rclip)
- rclip/model.py:214: note: "List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ rclip/model.py:214: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance

comtypes (https://github.com/enthought/comtypes)
- comtypes/tools/typedesc_base.py:194: note: "List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ comtypes/tools/typedesc_base.py:194: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
- comtypes/tools/typedesc_base.py:216: note: "List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ comtypes/tools/typedesc_base.py:216: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance

dragonchain (https://github.com/dragonchain/dragonchain)
- dragonchain/transaction_processor/level_4_actions_utest.py:73:50: note: "List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ dragonchain/transaction_processor/level_4_actions_utest.py:73:50: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance

materialize (https://github.com/MaterializeInc/materialize)
- misc/python/materialize/zippy/all_actions.py:43: note: "List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ misc/python/materialize/zippy/all_actions.py:43: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
- misc/python/materialize/parallel_workload/database.py:484: note: "List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ misc/python/materialize/parallel_workload/database.py:484: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
- misc/python/materialize/parallel_workload/database.py:644: note: "List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ misc/python/materialize/parallel_workload/database.py:644: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
- misc/python/materialize/parallel_workload/database.py:712: note: "List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ misc/python/materialize/parallel_workload/database.py:712: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
- misc/python/materialize/cli/ci_annotate_errors.py:715: note: "List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
+ misc/python/materialize/cli/ci_annotate_errors.py:715: note: "list" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance