Update containerd vendors to tags

Signed-off-by: Derek McGowan <derek@mcg.dev>

vendor/github.com/cilium/ebpf/CONTRIBUTING.md

@@ -0,0 +1,23 @@
+# How to contribute
+
+Development is on [GitHub](https://github.com/cilium/ebpf) and contributions in
+the form of pull requests and issues reporting bugs or suggesting new features
+are welcome. Please take a look at [the architecture](ARCHITECTURE.md) to get
+a better understanding for the high-level goals.
+
+New features must be accompanied by tests. Before starting work on any large
+feature, please [join](https://cilium.herokuapp.com/) the
+[#libbpf-go](https://cilium.slack.com/messages/libbpf-go) channel on Slack to
+discuss the design first.
+
+When submitting pull requests, consider writing details about what problem you
+are solving and why the proposed approach solves that problem in commit messages
+and/or pull request description to help future library users and maintainers to
+reason about the proposed changes.
+
+## Running the tests
+
+Many of the tests require privileges to set resource limits and load eBPF code.
+The easiest way to obtain these is to run the tests with `sudo`:
+
+    sudo go test ./...