clang-tidy: Apply modernize-deprecated-headers

This can be reproduced according to the developer notes with something
like

( cd ./src/ && ../contrib/devtools/run-clang-tidy.py -p ../bld-cmake -fix -j $(nproc) )

Also, the header related changes were done manually.

src/rpc/mining.cpp

@@ -44,7 +44,7 @@
 #include <validationinterface.h>
 
 #include <memory>
-#include <stdint.h>
+#include <cstdint>
 
 using interfaces::BlockRef;
 using interfaces::BlockTemplate;