Update maven Docker tag to v3.9.4 (#659)

renovate[bot] · web-flow · commit 09927f48a415 · 2023-09-03T19:56:22.000-06:00
Co-authored-by: renovate[bot] &lt;29139614+renovate[bot]@users.noreply.github.com&gt;
diff --git a/Dockerfile b/Dockerfile
@@ -1,5 +1,5 @@
 # syntax=docker/dockerfile:1.1.1-experimental
-FROM maven:3.9.3
+FROM maven:3.9.4@sha256:64de69ce79d9af45a39f5167e8fc6256af59184f62f0ab46e15187585ef37614
 COPY . /src
 WORKDIR /src
 RUN rm -rf .git
