bump golang to v1.21.9

[Prajyot-Parab]

What this PR does / why we need it:

• bump golang to v1.21.9
• fix trivy reported vulnerabilities

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

Release note:

bump golang to v1.21.9

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[Amulyam24]

@Prajyot-Parab. do we also want to update the version here -https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/blob/main/hack/ccm/Makefile#L16?

[Prajyot-Parab]

@Prajyot-Parab. do we also want to update the version here -https://github.com/kubernetes-sigs/cluster-api-provider-ibmcloud/blob/main/hack/ccm/Makefile#L16?

Nice catch, fixed it. (its not mandatory however good to keep everything in sync)

[Amulyam24]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Amulyam24, Prajyot-Parab

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