chore: bump kubectl from v1.28.3 to v1.29.0 (open-policy-agent#3193)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Sertaç Özercan <852750+sozercan@users.noreply.github.com>

crd.Dockerfile

@@ -1,4 +1,4 @@
-FROM --platform=$TARGETPLATFORM registry.k8s.io/kubectl:v1.28.3 as builder
+FROM --platform=$TARGETPLATFORM registry.k8s.io/kubectl:v1.29.0 as builder
 
 ARG TARGETPLATFORM
 ARG TARGETOS