Dockerfile: update to golang 1.21

Felix Wischke (65278) · wikkyk · commit 361d8954667a · 2024-04-03T12:20:47.000Z
diff --git a/Dockerfile b/Dockerfile
@@ -1,5 +1,5 @@
 # Build the manager binary
-FROM golang:1.20 AS builder
+FROM golang:1.21 AS builder
 ARG TARGETOS
 ARG TARGETARCH
 
