build(deps): Bump k8s.io/apimachinery in /receiver/kubeletstatsreceiver

Bumps [k8s.io/apimachinery](https://github.com/kubernetes/apimachinery) from 0.20.3 to 0.20.4.
- [Release notes](https://github.com/kubernetes/apimachinery/releases)
- [Commits](kubernetes/apimachinery@v0.20.3...v0.20.4)

Signed-off-by: dependabot[bot] <support@github.com>

receiver/kubeletstatsreceiver/go.mod

@@ -13,7 +13,7 @@ require (
 	google.golang.org/protobuf v1.25.0
 	gopkg.in/yaml.v2 v2.4.0
 	k8s.io/api v0.20.3
-	k8s.io/apimachinery v0.20.3
+	k8s.io/apimachinery v0.20.4
 	k8s.io/client-go v0.20.3
 	k8s.io/kubernetes v1.12.0
 )

receiver/kubeletstatsreceiver/go.sum

@@ -1488,6 +1488,8 @@ k8s.io/apimachinery v0.20.2 h1:hFx6Sbt1oG0n6DZ+g4bFt5f6BoMkOjKWsQFu077M3Vg=
 k8s.io/apimachinery v0.20.2/go.mod h1:WlLqWAHZGg07AeltaI0MV5uk1Omp8xaN0JGLY6gkRpU=
 k8s.io/apimachinery v0.20.3 h1:P0heYNTI2km9gTUAb0PX5qRd8oHAaesICvkg13k97y4=
 k8s.io/apimachinery v0.20.3/go.mod h1:WlLqWAHZGg07AeltaI0MV5uk1Omp8xaN0JGLY6gkRpU=
+k8s.io/apimachinery v0.20.4 h1:vhxQ0PPUUU2Ns1b9r4/UFp13UPs8cw2iOoTjnY9faa0=
+k8s.io/apimachinery v0.20.4/go.mod h1:WlLqWAHZGg07AeltaI0MV5uk1Omp8xaN0JGLY6gkRpU=
 k8s.io/client-go v0.19.2/go.mod h1:S5wPhCqyDNAlzM9CnEdgTGV4OqhsW3jGO1UM1epwfJA=
 k8s.io/client-go v0.20.2 h1:uuf+iIAbfnCSw8IGAv/Rg0giM+2bOzHLOsbbrwrdhNQ=
 k8s.io/client-go v0.20.2/go.mod h1:kH5brqWqp7HDxUFKoEgiI4v8G1xzbe9giaCenUWJzgE=