Bump tekton/pipelines v0.50.1 LTS in preparation of release

[khrm]

Changes

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• [ ] Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
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Release Notes

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[savitaashture]

@khrm can we bump pipeline version as 0.50.1 :thinking:

[khrm]

@savitaashture Yes.

[khrm]

@savitaashture Let's merge this.

[savitaashture]

/lgtm

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