Create v0.6.0 release of containerd-shim and shim-protos

[jsturtevant]

This releases the containerd-shim and shim-protos packages which contain several dependencies updates, new features and bug fixes (not all inclusive):

• 206

• 212

• 211

• 213

• 194

• 201

[Burning1020]

LGTM. Thanks

[mxpv]

• https://github.com/containerd/rust-extensions/releases/tag/shim-protos-v0.6.0
• https://github.com/containerd/rust-extensions/releases/tag/shim-v0.6.0