object_store(aws): percent encoding test fails with latest localstack

[wjones127]

Describe the bug

When testing with the latest localstack (1.0 and onward), we get this failure from S3 tests:

---- aws::tests::s3_test stdout ----
thread 'aws::tests::s3_test' panicked at 'assertion failed: `(left == right)`
  left: `[Path { raw: "a/b/c/foo.file" }]`,
 right: `[Path { raw: "a/b%2Fc/foo.file" }]`', object_store/src/lib.rs:638:9


failures:
    aws::credential::tests::test_instance_metadata
    aws::tests::s3_test

Not sure yet if this is a bug in localstack, or our implementation.

To Reproduce

Expected behavior

Additional context

[wjones127]

This is an issue upstream: localstack/localstack#7374

[alamb]

label_issue.py automatically added labels {'object-store'} from #3403