chore(deps): update image golang to v1.26.6

Author: renovate[bot]

Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 ## Build stage
-FROM golang:1.24.5-alpine@sha256:daae04ebad0c21149979cd8e9db38f565ecefd8547cf4a591240dc1972cf1399 as build
+FROM golang:1.26.6-alpine@sha256:3889b425f035be855a72fb4755265311293b6d414521f0a519d819df32222d83 as build
 
 RUN apk --no-cache add ca-certificates tzdata
 RUN addgroup --gid 65532 kani && \