fix: update Dockerfile Go version to 1.26 to match go.mod (babysit)

Author: STRRL

image/cloudflare-tunnel-ingress-controller/Dockerfile

@@ -3,7 +3,7 @@ ARG COVER=0
 ARG RUNTIME_BASE=gcr.io/distroless/static:nonroot
 
 # Build the manager binary
-FROM golang:1.25 AS builder
+FROM golang:1.26 AS builder
 
 ARG COVER
 ARG TARGETARCH