feat: update kubelet to 1.20.7

Also bumped the base image to the latest version with all the fixes.

See https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.20.md

Signed-off-by: Andrey Smirnov <smirnov.andrey@gmail.com>

Dockerfile

@@ -28,7 +28,7 @@ RUN wget -q -O /kubelet ${KUBELET_URL} \
 ARG TARGETARCH
 FROM builder-${TARGETARCH} as builder
 
-FROM us.gcr.io/k8s-artifacts-prod/build-image/debian-iptables:v12.1.2 as container
+FROM us.gcr.io/k8s-artifacts-prod/build-image/debian-iptables:buster-v1.6.0 as container
 
 RUN clean-install \
   bash \

Makefile

@@ -5,9 +5,9 @@ TAG ?= $(shell git describe --tag --always --dirty)
 BRANCH ?= $(shell git rev-parse --abbrev-ref HEAD)
 REGISTRY_AND_USERNAME := $(REGISTRY)/$(USERNAME)
 NAME := kubelet
-KUBELET_VER := v1.20.6
-KUBELET_SHA512_AMD64 := 584e17d70c2d29d561565fd929a3cb66f1bb41eec554da6dd9191b941ea985928e4b1b0a24de70386ba294358b51bf59bbd14b5eb9f3471b17ba8d044a151a00
-KUBELET_SHA512_ARM64 := d3b491984cce0afd8b4767eda030e209f5aac3bd8af82e91750a6dba73ff622cb6190c2b84c5be94a3b914cb440fbaefcef6a6850f72c2db70f4dfab797d1f83
+KUBELET_VER := v1.20.7
+KUBELET_SHA512_AMD64 := 1f452559879c15f5b7b446d05537fbcf40912326d7c9888cebb992a92e03b5d891e2eaca5967738a485845069c81f565de74435b300f0d93de8586249c95abc5
+KUBELET_SHA512_ARM64 := 934d4975af2ec06ea7d8517f5b611b1ebd5f5d1661f0037311787e103b7f934786782c0784526c7572cc098a942962a581d5ce9375be002ecf383d5befebbf80
 
 BUILD := docker buildx build
 PLATFORM ?= linux/amd64,linux/arm64