bug fixes

[5.5.6] - 2021-02-07

Fixed

• fixed failing test due to CI asking for mod tidy.
• fixed ineffectual assignment failures keeping vfs from achieving 100% in goreportcard.
• fixed #48 bug where 'invalid cross-device link' error occurs when renaming os files that are found on different devices/volumes including temp dirs.
• fixed #53 bug where s3 file tests were failing due to a deferred removal of a temp file.

Security

• Upgraded dependencies. Required regen of S3 API mock due to a couple new methods.
  SSH returns a different error text since Go 1.14 (only affects 1 test).