tests/go.mod: bump github.com/icinga/icinga-testing "version"

[Al2Klimov]

to include this fix:

• Icinga2Client#Do(): call parent method, re-try on HTTP 503 300 times icinga-testing#29

[oxzi]

This change does not only bump github.com/icinga/icinga-testing, but almost every other package, too. However, those are not necessary being updated to their latest version. For example, go.uber.org/zap went from v1.21.0 to v1.26.0, while v1.27.0 is available, #680. Thus, maybe you just want to add another round of go get -u ./...?

Otherwise, the tests went through on my machine.

[Al2Klimov]

In contrast, I think github.com/icinga/icinga-testing should be dependabotted.

[julianbrost]

What exactly does that mean? #695 will enable dependabot for /tests, I don't know if that will be enough, or if it can be configured to track a branch, or if that means we'd have to tag every merge commit in the icinga-testing repo.

Anyways, so far, I haven't merged #695 as it might result in PRs being created that would directly become obsoleted by this PR if it updates other dependencies as well.

IMHO, this PR should either update just icinga-testing or everything in /tests, not something in between. I have a slight preference towards just icinga-testing as that will be trivial to review and therefore should fix the GitHub Actions more quickly.

[julianbrost]

The version bump of icinga-testing also includes Icinga/icinga-testing#26. Thus, this PR is actually the minimal change to do that bump as it all other module updates just reflect the changed dependencies of icinga-testing.