Bump github.com/containernetworking/cni from 1.1.1 to 1.1.2

Bumps [github.com/containernetworking/cni](https://github.com/containernetworking/cni) from 1.1.1 to 1.1.2.
- [Release notes](https://github.com/containernetworking/cni/releases)
- [Commits](https://github.com/containernetworking/cni/compare/v1.1.1...v1.1.2)

---
updated-dependencies:
- dependency-name: github.com/containernetworking/cni
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

vendor/github.com/containernetworking/cni/pkg/invoke/exec.go

@@ -50,6 +50,12 @@ func fixupResultVersion(netconf, result []byte) (string, []byte, error) {
 		return "", nil, fmt.Errorf("failed to unmarshal raw result: %w", err)
 	}
 
+	// plugin output of "null" is successfully unmarshalled, but results in a nil
+	// map which causes a panic when the confVersion is assigned below.
+	if rawResult == nil {
+		rawResult = make(map[string]interface{})
+	}
+
 	// Manually decode Result version; we need to know whether its cniVersion
 	// is empty, while built-in decoders (correctly) substitute 0.1.0 for an
 	// empty version per the CNI spec.