Update outdated 3rd party packages

[poberg]

When scanning for vulnerabilities, testcontainers-go revels some issues related to outdated dependencies.

• CVE-2022-24769
• CVE-2021-31525
• CVE-2018-16875
• CVE-2021-44716
• CVE-2022-21698
• ...

I suggest update of some of the dependecies:

• github.com/containerd/containerd v1.5.9 -> v1.6.2
• github.com/docker/docker v20.10.11 -> v20.10.14
• github.com/go-redis/redis v6.15.9 -> v8.11.5
• github.com/magiconair/properties v1.8.5 -> v1.8.6
• github.com/moby/sys/mount v0.2.0 -> v0.3.1
• github.com/moby/sys/mountinfo v0.5.0 -> v0.6.0
• github.com/stretchr/testify v1.7.0 -> v1.7.1
• golang.org/x/net v0.0.0-20211108170745-6635138e15ea -> v0.0.0-20220403103023-749bd193bc2b
• golang.org/x/sys v0.0.0-20211124211545-fe61309f8881 -> v0.0.0-20220403205710-6acee93ad0eb
• gotest.tools/v3 v3.0.3 -> v3.1.0