Migrate to containerd v1.7.0 and update dependencies

* Updates containerd to v1.7.0 and new binary for 32-bit
Arm OSes.
* Updates Go dependencies - openfaas and external

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

vendor/google.golang.org/grpc/encoding/encoding.go

@@ -19,7 +19,7 @@
 // Package encoding defines the interface for the compressor and codec, and
 // functions to register and retrieve compressors and codecs.
 //
-// Experimental
+// # Experimental
 //
 // Notice: This package is EXPERIMENTAL and may be changed or removed in a
 // later release.
@@ -28,6 +28,8 @@ package encoding
 import (
 	"io"
 	"strings"
+
+	"google.golang.org/grpc/internal/grpcutil"
 )
 
 // Identity specifies the optional encoding for uncompressed streams.
@@ -73,6 +75,9 @@ var registeredCompressor = make(map[string]Compressor)
 // registered with the same name, the one registered last will take effect.
 func RegisterCompressor(c Compressor) {
 	registeredCompressor[c.Name()] = c
+	if !grpcutil.IsCompressorNameRegistered(c.Name()) {
+		grpcutil.RegisteredCompressorNames = append(grpcutil.RegisteredCompressorNames, c.Name())
+	}
 }
 
 // GetCompressor returns Compressor for the given compressor name.
@@ -108,7 +113,7 @@ var registeredCodecs = make(map[string]Codec)
 // more details.
 //
 // NOTE: this function must only be called during initialization time (i.e. in
-// an init() function), and is not thread-safe.  If multiple Compressors are
+// an init() function), and is not thread-safe.  If multiple Codecs are
 // registered with the same name, the one registered last will take effect.
 func RegisterCodec(codec Codec) {
 	if codec == nil {