chore(deps): update golang docker tag to v1.25.4 (#65)

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

Author: renovate[bot]

Dockerfile

@@ -1,5 +1,5 @@
 # Build the k6 binary with the extension
-FROM golang:1.25.3@sha256:7d73c4c57127279b23f3f70cbb368bf0fe08f7ab32af5daf5764173d25e78b74 as builder
+FROM golang:1.25.4@sha256:5d73b7b83dd6e0258ff62832c93b6ea208fbb7727985d265fb49f75f81fc3d1f as builder
 
 ENV GRAFANA_K6_VERSION="0.56.0"
 ENV XK6_MONGO_VERSION="0.2.0"