🌱 Bump shellcheck version (0.8.0 -> 0.9.0)

[oscr]

What this PR does / why we need it:

• Updates shellcheck version to latest and greatest (0.8.0 -> 0.9.0)
• Moves the version from the verify-shellcheck script to the Makefile

[oscr]

/test pull-cluster-api-test-main

[killianmuldoon]

/lgtm

[fabriziopandini]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini

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• OWNERS [fabriziopandini]

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[fabriziopandini]

/cherry-pick release-1.3

[k8s-infra-cherrypick-robot]

@fabriziopandini: once the present PR merges, I will cherry-pick it on top of release-1.3 in a new PR and assign it to you.

In response to this:

/cherry-pick release-1.3

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[k8s-infra-cherrypick-robot]

@fabriziopandini: new pull request created: #7745

In response to this:

/cherry-pick release-1.3

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[fabriziopandini]

/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@fabriziopandini: #7737 failed to apply on top of branch "release-1.2":

Applying: Bump shellcheck version (0.8.0 -> 0.9.0)
Using index info to reconstruct a base tree...
M	Makefile
M	hack/verify-shellcheck.sh
Falling back to patching base and 3-way merge...
Auto-merging hack/verify-shellcheck.sh
CONFLICT (content): Merge conflict in hack/verify-shellcheck.sh
Auto-merging Makefile
CONFLICT (content): Merge conflict in Makefile
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 Bump shellcheck version (0.8.0 -> 0.9.0)
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-1.2

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.