⬆️ Upgrade to Java 21 and Node.js 22

Why:
- Upgrade to the latest Java LTS and the latest Node.js.
- Now that CI uses asdf, we are no longer limited to the versions that
  are available on Semaphore CI.

.tool-versions

@@ -1,2 +1,2 @@
-java temurin-17.0.9+9
-nodejs 21.2.0
+java temurin-21.0.4+7.0.LTS
+nodejs 22.9.0

Dockerfile

@@ -1,11 +1,11 @@
-FROM eclipse-temurin:17-jre-focal
+FROM eclipse-temurin:21-jre
 
 EXPOSE 8080
 ENV PORT=8080 \
     DATABASE_URL="jdbc:postgresql://localhost/territorybro?user=territorybro&password=territorybro"
 
 # the user should have no write permissions, even to its home
-RUN adduser --no-create-home --home /app app && \
+RUN useradd --no-create-home --home /app app && \
     mkdir /app
 WORKDIR /app
 

project.clj

@@ -72,7 +72,7 @@
 
   :source-paths ["src"]
   :java-source-paths ["src-java"]
-  :javac-options ["--release" "17"]
+  :javac-options ["--release" "21"]
   :test-paths ["test"]
   :resource-paths ["resources" "target/web-dist"]
   :target-path "target/%s/"