Bump supported Python version to 3.7

[tsotnet]

Signed-off-by: Tsotne Tabidze tsotne@tecton.ai

What this PR does / why we need it: Currently, setup.py incorrectly supports Python 3.6. Bumping the version to 3.7.

Which issue(s) this PR fixes:

Fixes #1502

Does this PR introduce a user-facing change?:

NONE

[tsotnet]

/test test-telemetry

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[woop]

/lgtm

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[Joostrothweiler]

Are there other reasons besides the issue described in #1502 that makes us no longer want to support Python 3.6? We are currently running Python 3.6 (with Feast 0.8) and it seems to me could work around the issue described quite easily by casting the _db_path to a string as described by @chappers in the issue.

Did a quick test run and the following works on Python 3.6 for feast init & feast apply:

class LocalProvider(Provider):
    _db_path: Path

    def __init__(self, config: RepoConfig, repo_path: Path):
        ...
        if local_path.is_absolute():
            self._db_path = str(local_path)
        else:
            self._db_path = str(repo_path.joinpath(local_path))
        self.offline_store = get_offline_store_from_config(config.offline_store)
...

[8bit-pixies]

Just an FYI; the rationale was provided here: #1503 (comment)

[Joostrothweiler]

Thanks @chappers for pointing that out.