refactor: use std::map for deterministic ordering in SimCalorimeterHitProcessor (fix: iwyu) (#2162)

This PR applies the include-what-you-use fixes as suggested by
https://github.com/eic/EICrecon/actions/runs/18892744942.
Please merge this PR into the branch `SimCalorimeterHitProcessor-map`
to resolve failures in PR #2161.

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Author: wdconinc

src/algorithms/calorimetry/SimCalorimeterHitProcessor.cc

@@ -20,10 +20,9 @@
 #include <functional>
 #include <gsl/pointers>
 #include <limits>
+#include <map>
 #include <stdexcept>
 #include <tuple>
-#include <unordered_map>
-#include <map>
 #include <variant>
 #include <vector>