Bump github.com/containerd/containerd from 1.7.20 to 1.7.21 (#1426)

Bumps [github.com/containerd/containerd](https://github.com/containerd/containerd) from 1.7.20 to 1.7.21.
- [Release notes](https://github.com/containerd/containerd/releases)
- [Changelog](https://github.com/containerd/containerd/blob/main/RELEASES.md)
- [Commits](containerd/containerd@v1.7.20...v1.7.21)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -5,7 +5,7 @@ go 1.22.5
 require (
 	github.com/akrylysov/pogreb v0.10.2
 	github.com/blang/semver/v4 v4.0.0
-	github.com/containerd/containerd v1.7.20
+	github.com/containerd/containerd v1.7.21
 	github.com/containers/common v0.60.2
 	github.com/containers/image/v5 v5.32.2
 	github.com/distribution/distribution/v3 v3.0.0-beta.1
@@ -133,7 +133,8 @@ require (
 	github.com/moby/spdystream v0.4.0 // indirect
 	github.com/moby/sys/mountinfo v0.7.2 // indirect
 	github.com/moby/sys/sequential v0.5.0 // indirect
-	github.com/moby/sys/user v0.2.0 // indirect
+	github.com/moby/sys/user v0.3.0 // indirect
+	github.com/moby/sys/userns v0.1.0 // indirect
 	github.com/moby/term v0.5.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect

go.sum

@@ -47,8 +47,8 @@ github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDk
 github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
 github.com/containerd/cgroups/v3 v3.0.3 h1:S5ByHZ/h9PMe5IOQoN7E+nMc2UcLEM/V48DGDJ9kip0=
 github.com/containerd/cgroups/v3 v3.0.3/go.mod h1:8HBe7V3aWGLFPd/k03swSIsGjZhHI2WzJmticMgVuz0=
-github.com/containerd/containerd v1.7.20 h1:Sl6jQYk3TRavaU83h66QMbI2Nqg9Jm6qzwX57Vsn1SQ=
-github.com/containerd/containerd v1.7.20/go.mod h1:52GsS5CwquuqPuLncsXwG0t2CiUce+KsNHJZQJvAgR0=
+github.com/containerd/containerd v1.7.21 h1:USGXRK1eOC/SX0L195YgxTHb0a00anxajOzgfN0qrCA=
+github.com/containerd/containerd v1.7.21/go.mod h1:e3Jz1rYRUZ2Lt51YrH9Rz0zPyJBOlSvB3ghr2jbVD8g=
 github.com/containerd/containerd/api v1.7.19 h1:VWbJL+8Ap4Ju2mx9c9qS1uFSB1OVYr5JJrW2yT5vFoA=
 github.com/containerd/containerd/api v1.7.19/go.mod h1:fwGavl3LNwAV5ilJ0sbrABL44AQxmNjDRcwheXDb6Ig=
 github.com/containerd/continuity v0.4.2 h1:v3y/4Yz5jwnvqPKJJ+7Wf93fyWoCB3F5EclWG023MDM=
@@ -271,8 +271,10 @@ github.com/moby/sys/mountinfo v0.7.2 h1:1shs6aH5s4o5H2zQLn796ADW1wMrIwHsyJ2v9Kou
 github.com/moby/sys/mountinfo v0.7.2/go.mod h1:1YOa8w8Ih7uW0wALDUgT1dTTSBrZ+HiBLGws92L2RU4=
 github.com/moby/sys/sequential v0.5.0 h1:OPvI35Lzn9K04PBbCLW0g4LcFAJgHsvXsRyewg5lXtc=
 github.com/moby/sys/sequential v0.5.0/go.mod h1:tH2cOOs5V9MlPiXcQzRC+eEyab644PWKGRYaaV5ZZlo=
-github.com/moby/sys/user v0.2.0 h1:OnpapJsRp25vkhw8TFG6OLJODNh/3rEwRWtJ3kakwRM=
-github.com/moby/sys/user v0.2.0/go.mod h1:RYstrcWOJpVh+6qzUqp2bU3eaRpdiQeKGlKitaH0PM8=
+github.com/moby/sys/user v0.3.0 h1:9ni5DlcW5an3SvRSx4MouotOygvzaXbaSrc/wGDFWPo=
+github.com/moby/sys/user v0.3.0/go.mod h1:bG+tYYYJgaMtRKgEmuueC0hJEAZWwtIbZTB+85uoHjs=
+github.com/moby/sys/userns v0.1.0 h1:tVLXkFOxVu9A64/yh59slHVv9ahO9UIev4JZusOLG/g=
+github.com/moby/sys/userns v0.1.0/go.mod h1:IHUYgu/kao6N8YZlp9Cf444ySSvCmDlmzUcYfDHOl28=
 github.com/moby/term v0.5.0 h1:xt8Q1nalod/v7BqbG21f8mQPqH+xAaC9C3N3wfWbVP0=
 github.com/moby/term v0.5.0/go.mod h1:8FzsFHVUBGZdbDsJw/ot+X+d5HLUbvklYLJ9uGfcI3Y=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=