chore: update to v2.1.3_230818 modified by ST from: https://github.com/STMicroelectronics/stm32_mw_lwip Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

Update README.md 

Update library.properties Signed-off-by: Frederic.Pillon <frederic.pillon@st.com>

Merge pull request #1 from fprwi6labs/LwIP_src LwIP source files