chore(deps): Bump golang in /docker

Bumps golang from 1.22.4-alpine3.19 to 1.22.6-alpine3.19.

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

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

docker/Dockerfile_txsim

@@ -1,5 +1,5 @@
 # Stage 1: generate celestia-appd binary
-FROM --platform=$BUILDPLATFORM docker.io/golang:1.22.4-alpine3.19 as builder
+FROM --platform=$BUILDPLATFORM docker.io/golang:1.22.6-alpine3.19 as builder
 
 ARG TARGETOS
 ARG TARGETARCH