🌱 Bump golang to v1.21.7

[Sunnatillo]

as title

[kashifest]

/approve

[metal3-io-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kashifest

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[Sunnatillo]

/test-centos-e2e-integration-main
/test-ubuntu-integration-main

[adilGhaffarDev]

/lgtm

[adilGhaffarDev]

/cherry-pick release-1.6

[metal3-io-bot]

@adilGhaffarDev: #1476 failed to apply on top of branch "release-1.6":

Applying: Bump golang to v1.21.7
Using index info to reconstruct a base tree...
M	Dockerfile
M	Makefile
Falling back to patching base and 3-way merge...
Auto-merging Makefile
CONFLICT (content): Merge conflict in Makefile
Auto-merging Dockerfile
CONFLICT (content): Merge conflict in Dockerfile
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 golang to v1.21.7
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-1.6

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.

[adilGhaffarDev]

/cherry-pick release-1.5

[metal3-io-bot]

@adilGhaffarDev: #1476 failed to apply on top of branch "release-1.5":

Applying: Bump golang to v1.21.7
Using index info to reconstruct a base tree...
M	Dockerfile
M	Makefile
Falling back to patching base and 3-way merge...
Auto-merging Makefile
CONFLICT (content): Merge conflict in Makefile
Auto-merging Dockerfile
CONFLICT (content): Merge conflict in Dockerfile
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 golang to v1.21.7
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-1.5

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.