Fix trivy analysis reported issues

[Prajyot-Parab]

What this PR does / why we need it:

• Fix trivy analysis reported issues
  • bump golang to v1.21.8
  • bump oras-go to v1.2.5

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:

Fix trivy analysis reported issues

[Prajyot-Parab]

/hold for @Amulyam24 review.

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[Amulyam24]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[Amulyam24]

@Prajyot-Parab, can we update github.com/aquasecurity/trivy from 0.48.3 to 0.50.1 as a part of this PR and check?

[Prajyot-Parab]

@Prajyot-Parab, can we update github.com/aquasecurity/trivy from 0.48.3 to 0.50.1 as a part of this PR and check?

@Amulyam24 that wont work for now.

It is dependent on this PR of mine - aquasecurity/trivy#6387

[Amulyam24]

/unhold