nanopb: upgrade 0.4.6.4 -> 0.4.7

Changelog:
==========
 Fix comments generation for submessages (#788)
 Fix handling of spaces in arguments passed through protoc (#810)
 Fix problems with multiple files and mangle_names option (#783, #820)
 Fix generator error when using M_STRIP_PACKAGE without package name (#795)
 Fix compilation error with fixed size array and FT_POINTER (#630)
 Fix wrong format in Python Poetry project file (#811)
 Fix unnecessary generator message when using --quiet (#831)
 Fix enum_to_string with C++ (#838)
 Fix /* */ inside .proto file comment
 Workaround python-protobuf version issues (#787)
 Safeguard substraction in pb_read() with custom streams (#697)
 Always include pb_release() as function, instead of macro. (#802)
 Allow using = instead of : with generator option -s
 Allow specifying include format without special characters (#810)
 Allow including headers from inside of extern C (#814)
 Add option NANOPB_PB2_TEMP_DIR to store nanopb_pb2.py in a temporary dir (#601)
 Add compile-time error message for when PB_FIELD_32BIT is needed (#680, #827)
 Add --c-style command line option for naming style (#199, #533, #791)
 Add --protoc-opt to nanopb_generator.py (#628)
 Add ENUMTYPE convenience macros (#803)
 Add Bazel build rules (#360, #500)
 Generator: keep order of messages when possible
 Test case improvements (#792)
 PlatformIO build rule improvements (#808, #809, #819, #834, #839, #840)
 CMake build rule improvements (#822)
 CMakeLists: use protoc wrapper script by default (#769)

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

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