Bump github.com/containerd/containerd from 1.7.20 to 1.7.21

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] <[email protected]>

go.mod

@@ -4,7 +4,7 @@ go 1.22.5
 
 require (
 	github.com/alexflint/go-arg v1.5.1
-	github.com/containerd/containerd v1.7.20
+	github.com/containerd/containerd v1.7.21
 	github.com/containerd/containerd/api v1.7.19
 	github.com/containerd/errdefs v0.1.0
 	github.com/containerd/typeurl/v2 v2.2.0
@@ -127,7 +127,8 @@ require (
 	github.com/moby/sys/mountinfo v0.6.2 // indirect
 	github.com/moby/sys/sequential v0.5.0 // indirect
 	github.com/moby/sys/signal v0.7.0 // indirect
-	github.com/moby/sys/user v0.1.0 // indirect
+	github.com/moby/sys/user v0.3.0 // indirect
+	github.com/moby/sys/userns v0.1.0 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/mr-tron/base58 v1.2.0 // indirect

go.sum

@@ -46,8 +46,8 @@ github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGX
 github.com/containerd/cgroups v0.0.0-20201119153540-4cbc285b3327/go.mod h1:ZJeTFisyysqgcCdecO57Dj79RfL0LNeGiFUqLYQRYLE=
 github.com/containerd/cgroups v1.1.0 h1:v8rEWFl6EoqHB+swVNjVoCJE8o3jX7e8nqBGPLaDFBM=
 github.com/containerd/cgroups v1.1.0/go.mod h1:6ppBcbh/NOOUU+dMKrykgaBnK9lCIBxHqJDGwsa1mIw=
-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=
@@ -341,8 +341,10 @@ github.com/moby/sys/sequential v0.5.0 h1:OPvI35Lzn9K04PBbCLW0g4LcFAJgHsvXsRyewg5
 github.com/moby/sys/sequential v0.5.0/go.mod h1:tH2cOOs5V9MlPiXcQzRC+eEyab644PWKGRYaaV5ZZlo=
 github.com/moby/sys/signal v0.7.0 h1:25RW3d5TnQEoKvRbEKUGay6DCQ46IxAVTT9CUMgmsSI=
 github.com/moby/sys/signal v0.7.0/go.mod h1:GQ6ObYZfqacOwTtlXvcmh9A26dVRul/hbOZn88Kg8Tg=
-github.com/moby/sys/user v0.1.0 h1:WmZ93f5Ux6het5iituh9x2zAG7NFY9Aqi49jjE1PaQg=
-github.com/moby/sys/user v0.1.0/go.mod h1:fKJhFOnsCN6xZ5gSfbM6zaHGgDJMrqt9/reuj4T7MmU=
+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/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd h1:TRLaZ9cD/w8PVh93nsPXa1VrQ6jlwL5oN8l14QlcNfg=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=