chore(deps): update golang docker tag to v1.26.4

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

Author: renovate[bot]

Dockerfile

@@ -1,7 +1,7 @@
 # Copyright (c) 2024 VEXXHOST, Inc.
 # SPDX-License-Identifier: Apache-2.0
 
-FROM golang:1.25.3@sha256:6d4e5e74f47db00f7f24da5f53c1b4198ae46862a47395e30477365458347bf2 AS builder
+FROM golang:1.26.4@sha256:d184d9be4c13614e28498d632eeaaac704d662f18ad357e1df74a44424236cea AS builder
 WORKDIR /src
 COPY go.mod go.sum /src/
 RUN go mod download