chore(deps): update docker.io/library/golang docker tag to v1.21.3 (#640

)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Dockerfile

@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM docker.io/library/golang:1.21.2@sha256:e9ebfe932adeff65af5338236f0b0604c86b143c1bff3e1d0551d8f6196ab5c5 as builder
+FROM docker.io/library/golang:1.21.3@sha256:4d5cf6cb9269c5867ccf86b8282897b7eb4764d9739b1a19d8cc68643bbc3f3c as builder
 ARG GOPROXY
 ARG TARGETOS
 ARG TARGETARCH