Update Dockerfile

Dockerfile

@@ -1,4 +1,4 @@
-FROM eclipse-temurin:17-jre
+FROM eclipse-temurin:21-jre
 
 WORKDIR /opt/halo
 
@@ -10,7 +10,7 @@ RUN apt-get update && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
-RUN curl -sL https://api.github.com/repos/halo-dev/halo/releases/tags/v2.20.21 | \
+RUN curl -sL https://api.github.com/repos/halo-dev/halo/releases/tags/v2.21.0 | \
     jq -r '.assets[] | select(.name | test(".jar$")) | .browser_download_url' | \
     xargs curl -L -o halo.jar