Bump to golang 1.21 and golang.org/x/mod v0.14.0

[ReToCode]

Context

• Bump to golang 1.21 and golang.org/x/mod v0.14.0

Fixes #24

/lint

/assign @skonto

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[ReToCode]

/override "style / Golang / Auto-format and Check"

[knative-prow]

@ReToCode: Overrode contexts on behalf of ReToCode: style / Golang / Auto-format and Check

In response to this:

/override "style / Golang / Auto-format and Check"

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[ReToCode]

PTAL, discussion here

/assign @cardil
/assign @kvmware
/assign @psschwei
/assign @upodroid

Also this repo seems to be outdated with GH action sync and peribolos sync.

[ReToCode]

/assign @krsna-m

[dsimansk]

/approve
/lgtm

For others
/hold

[knative-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dsimansk, ReToCode

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[krsna-m]

/unhold

[upodroid]

+1