Microbenchmark: upgrade Intel MLC to v3.12 in rocm5.0.x (#784)

## Summary
- Upgrade Intel Memory Latency Checker from v3.11 to v3.12 in
rocm5.0.x.dockerfile
- Aligns with other dockerfiles that already use v3.12
Co-authored-by: Hongtao Zhang <hongtaozhang@microsoft.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

dockerfile/rocm5.0.x.dockerfile

@@ -98,7 +98,7 @@ RUN cd /tmp && \
 
 # Install Intel MLC
 RUN cd /tmp && \
-    wget -q https://downloadmirror.intel.com/793041/mlc_v3.11.tgz -O mlc.tgz && \
+    wget -q https://downloadmirror.intel.com/866182/mlc_v3.12.tgz -O mlc.tgz && \
     tar xzf mlc.tgz Linux/mlc && \
     cp ./Linux/mlc /usr/local/bin/ && \
     rm -rf ./Linux mlc.tgz