🐛 Fix stm32f103c8 demo platform file #55

Job	Run time
demo_check_lpc4074 / build	1m 22s
demo_check_mod-lpc40-v5 / build	1m 21s
demo_check_lpc4078 / build	1m 25s
demo_check_mod-stm32f1-v4 / build	1m 21s
demo_check_stm32f103c8 / build	1m 18s
ci / lint / lint	23s
ci / docs / docs	8s
ci / tests / run_tests (ubuntu-22.04, sudo apt remove clang-tidy && wget https://apt.llvm.org/llvm.sh && chmod...	59s
ci / tests / run_tests (ubuntu-24.04, sudo apt remove clang-tidy && wget https://apt.llvm.org/llvm.sh && chmod...	1m 13s
ci / tests / run_tests (macos-13, brew install llvm@17 && sudo ln -s $(brew --prefix llvm)/bin/clang-tidy /usr...	2m 41s
deploy_all_check / cortex-m0 / deploy	1m 23s
deploy_all_check / cortex-m0plus / deploy	1m 17s
ci / tests / run_tests (macos-14, brew install llvm@17 && sudo ln -s $(brew --prefix llvm)/bin/clang-tidy /usr...	1m 44s
ci / tests / run_tests (macos-15, brew install llvm@17 && sudo ln -s $(brew --prefix llvm)/bin/clang-tidy /usr...	1m 40s
deploy_all_check / cortex-m1 / deploy	1m 17s
deploy_all_check / cortex-m3 / deploy	1m 15s
deploy_all_check / cortex-m4 / deploy	1m 21s
deploy_all_check / cortex-m4f / deploy	1m 15s
deploy_all_check / linux_x86_64_clang / deploy	55s
	24m 18s

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