fix: Bad format char

[ntlhui]

[build] [  6%] Building CXX object pc_hal/CMakeFiles/smartfin_pc.dir/__/src/cellular/recorder.cpp.o
[build] src/cellular/recorder.cpp: In function ‘void REC_build_data_filename(uint32_t, char*, size_t)’:
[build] src/cellular/recorder.cpp:31:19: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘uint32_t’ {aka ‘unsigned int’} [-Wformat=]
[build]    31 | #define DATA_ROOT "/data"
[build]       |                   ^
[build] src/cellular/recorder.cpp:47:14: note: in expansion of macro ‘DATA_ROOT’
[build]    47 |              DATA_ROOT "/%010lu.bin",
[build]       |              ^~~~~~~~~
[build] src/cellular/recorder.cpp:47:31: note: format string is defined here
[build]    47 |              DATA_ROOT "/%010lu.bin",
[build]       |                          ~~~~~^
[build]       |                               |
[build]       |                               long unsigned int
[build]       |                          %010u

Consider using https://en.cppreference.com/w/cpp/header/cinttypes