Bump golang from 1.26.2 to 1.26.3

Bumps golang from 1.26.2 to 1.26.3.

---
updated-dependencies:
- dependency-name: golang
  dependency-version: 1.26.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

dev.dockerfile

@@ -1,5 +1,5 @@
 # update together with .github/workflows/ci.yml
-FROM golang:1.26.2 AS go
+FROM golang:1.26.3 AS go
 
 # update together with .github/workflows/ci.yml
 FROM golangci/golangci-lint:v2.12.2 AS linter