full diff: https://github.com/containernetworking/plugins/compare/v0.8.6...v0.9.1
changes in vendored code:
- (in containernetworking/plugins): Fix race condition in GetCurrentNS
- (in containernetworking/cni): tighten up plugin-finding logic
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>