chore(deps): update golang docker tag to v1.26.5 (#1113)

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

Author: renovate[bot]

images/alpha.Dockerfile

@@ -11,7 +11,7 @@ COPY ./docs ./src/assets/docs
 RUN npm install
 RUN npm run build-dashboard
 
-FROM golang:1.26.4-alpine@sha256:3ad57304ad93bbec8548a0437ad9e06a455660655d9af011d58b993f6f615648 AS gobuild
+FROM golang:1.26.5-alpine@sha256:99e12cfb19b753915f9b9fdc5a99f1869a24a69d3a0955832d5702e7fa68f1be AS gobuild
 
 ARG VERSION=dev