sg: bump github.com/moby/buildkit (#48625)

[The following PR](https://buildkite.com/sourcegraph/sourcegraph/builds/203366#0186a7e9-03e6-45ca-9ebe-217090d905b1)
is failing because `sg lint dockerfiles` doesnt understand HEREDOCS in
Dockerfiles due to outdated github.com/moby/buildkit

## Test plan

Built and ran `./sg lint dockerfiles` locally

go.mod

@@ -19,11 +19,11 @@ require (
 	github.com/aws/aws-sdk-go-v2 v1.17.4
 	github.com/aws/aws-sdk-go-v2/config v1.18.12
 	github.com/aws/aws-sdk-go-v2/credentials v1.13.12
-	github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.9.1
+	github.com/aws/aws-sdk-go-v2/feature/s3/manager v1.11.10
 	github.com/aws/aws-sdk-go-v2/service/cloudwatch v1.15.0
 	github.com/aws/aws-sdk-go-v2/service/codecommit v1.11.0
 	github.com/aws/aws-sdk-go-v2/service/kms v1.14.0
-	github.com/aws/aws-sdk-go-v2/service/s3 v1.24.1
+	github.com/aws/aws-sdk-go-v2/service/s3 v1.26.9
 	github.com/aws/smithy-go v1.13.5
 	github.com/beevik/etree v1.1.0
 	github.com/buildkite/go-buildkite/v3 v3.0.1
@@ -39,7 +39,7 @@ require (
 	github.com/dgraph-io/ristretto v0.1.0
 	github.com/distribution/distribution/v3 v3.0.0-20220128175647-b60926597a1b
 	github.com/dnaeon/go-vcr v1.2.0
-	github.com/docker/docker-credential-helpers v0.6.4
+	github.com/docker/docker-credential-helpers v0.7.0
 	github.com/fatih/color v1.14.1
 	github.com/felixge/fgprof v0.9.3
 	github.com/felixge/httpsnoop v1.0.3
@@ -100,7 +100,7 @@ require (
 	github.com/mcuadros/go-version v0.0.0-20190830083331-035f6764e8d2
 	github.com/microcosm-cc/bluemonday v1.0.22
 	github.com/mitchellh/hashstructure v1.1.0
-	github.com/moby/buildkit v0.9.3
+	github.com/moby/buildkit v0.11.3
 	github.com/mxk/go-flowrate v0.0.0-20140419014527-cca7078d478f
 	github.com/opencontainers/go-digest v1.0.0
 	github.com/opentracing-contrib/go-stdlib v1.0.0
@@ -200,6 +200,8 @@ require (
 
 require (
 	cloud.google.com/go/compute/metadata v0.2.3 // indirect
+	github.com/aws/aws-sdk-go-v2/internal/v4a v1.0.1 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/checksum v1.1.5 // indirect
 	github.com/aws/aws-sdk-go-v2/service/ssooidc v1.14.1 // indirect
 	github.com/bahlo/generic-list-go v0.2.0 // indirect
 	github.com/buger/jsonparser v1.1.1 // indirect
@@ -315,14 +317,14 @@ require (
 	github.com/andres-erbsen/clock v0.0.0-20160526145045-9e14626cd129 // indirect
 	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d // indirect
 	github.com/aws/aws-sdk-go v1.44.128
-	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.2.0 // indirect
+	github.com/aws/aws-sdk-go-v2/aws/protocol/eventstream v1.4.1 // indirect
 	github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.12.22 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/configsources v1.1.28 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.4.22 // indirect
 	github.com/aws/aws-sdk-go-v2/internal/ini v1.3.29 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.7.0 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.9.1 // indirect
 	github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.9.22 // indirect
-	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.11.0 // indirect
+	github.com/aws/aws-sdk-go-v2/service/internal/s3shared v1.13.4 // indirect
 	github.com/aws/aws-sdk-go-v2/service/sso v1.12.1 // indirect
 	github.com/aws/aws-sdk-go-v2/service/sts v1.18.3 // indirect
 	github.com/aymerick/douceur v0.2.0 // indirect
@@ -343,7 +345,7 @@ require (
 	github.com/djherbis/buffer v1.2.0 // indirect
 	github.com/djherbis/nio/v3 v3.0.1 // indirect
 	github.com/dlclark/regexp2 v1.8.0 // indirect
-	github.com/docker/docker v20.10.21+incompatible // indirect
+	github.com/docker/docker v23.0.0-rc.1+incompatible // indirect
 	github.com/docker/go-connections v0.4.0 // indirect
 	github.com/docker/go-units v0.5.0 // indirect
 	github.com/dustin/go-humanize v1.0.0