CI: Update mozilla-actions/sccache-action to 0.0.8

[lukeshingles]

The existing version (0.0.3) of sccache-action uses a decommissioned version of the GitHub cache action.

Error seen in #134.

(REVERTED: Will not be needed after polars dep is updated to 0.47 is on main, #137) Also restricted python polars version <1.22 in example/extend_polars_python_dispatch/requirements.txt to work around incompatibility until the next rust polars release. Error was:

    print(lazy_parallel_jaccard(df.lazy(), "list_a", "list_b").collect())
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
RuntimeError: BindingsError: "Error when deserializing LazyFrame. This may be due to mismatched polars versions. invalid value: integer `1598837572`, expected variant index 0 <= i < 18"```

[lukeshingles]

Fixed in #141.