fix[vault]: Update to chart 0.20.1

See merge request !62

Bump ingress and cluster-application-image

See merge request !63

Version `0.5.0` is too old and incompatible with Kubernetes 1.23:
```
"vault-helm" has been added to your repositories
Comparing release=vault, chart=vault-helm/vault
in /builds/univention/dist/gitlabclustermanagement/helmfile.yaml: in .helmfiles[1]: in applications/vault/helmfile.yaml: command "/usr/bin/helm" exited with non-zero status:
PATH:
  /usr/bin/helm
ARGS:
  0: helm (4 bytes)
  1: diff (4 bytes)
  2: upgrade (7 bytes)
  3: --reset-values (14 bytes)
  4: --allow-unreleased (18 bytes)
  5: vault (5 bytes)
  6: vault-helm/vault (16 bytes)
  7: --version (9 bytes)
  8: 0.5.0 (5 bytes)
  9: --namespace (11 bytes)
  10: gitlab-managed-apps (19 bytes)
  11: --values (8 bytes)
  12: /tmp/helmfile397223341/gitlab-managed-apps-vault-values-b565d4d9c (65 bytes)
  13: --detailed-exitcode (19 bytes)
  14: --suppress-secrets (18 bytes)
ERROR:
  exit status 1
EXIT STATUS
  1
STDERR:
  Error: Failed to render chart: exit status 1: Error: unable to build kubernetes objects from...

Improve the default .gitlab-ci.yml

See merge request !47

feat: Update GitLab Runner Helm Chart to 0.43.0/15.2.0

See merge request !61

feat: Update GitLab Runner Helm Chart to 0.42.0/15.1.0

See merge request !59

prevent KUBECONFIG insecure warning

See merge request !51

feat: Update GitLab Runner Helm Chart to 0.41.0/15.0.0

See merge request !58

Remove support for elastic stack

See merge request !57

Add renovate support

See merge request !55

Update prometheus to 15.x

Closes #18

See merge request !56

This reverts merge request !54

Revert "Merge branch 'nagyv-gitlab-master-patch-64465' into 'master'"

See merge request !54

This reverts merge request !50

Add renovate support

See merge request !50

Improve the default RBAC permission for GitLab Runner

See merge request !36

feat: Update GitLab Runner Helm Chart to 0.40.1/14.10.1

See merge request !53

Remove Falco, AppArmor, Fluentd

See merge request !52

feat: Update GitLab Runner Helm Chart to 0.40.0/14.10.0

See merge request !49

Upgrade ingress to 4.0.19

See merge request !46

feat: Update GitLab Runner Helm Chart to 0.39.0/14.9.0

See merge request !45

feat: Update GitLab Runner Helm Chart to 0.38.0/14.8.0

See merge request !43

Rename cert-manager folders and update to 1.7

See merge request !23