Update Cargo.lock

Note: a build of this commit was deployed as 2.2.8 as well.

This commit bumps tokio to 1.6.1 to fix a major issue caused by
tokio-rs/tokio#3803

Because of the tokio issue, during the storing of files to gdrive,
JSON responses from Google were truncated and thus failed to parse.

Some example errors were:

storage_write::create_stash_file_from_local_file(..., ...) failed, 29 tries left (next in 5 sec): EOF while parsing a value at line 1 column 0

storage_write::create_stash_file_from_local_file(..., ...) failed, 29 tries left (next in 5 sec): EOF while parsing a value at line 1 column 1