Remove Sampa from the maintainers list

I appreciate the contributions made by @Sampa to the OpenBMC
project. However, I haven't seen any active involvement from her
since 2021. While it's understandable that priorities may shift,
I want to express gratitude for her past contributions.

Thank you Sampa, for your past efforts.

Change-Id: I91c6ba7553753dfbc0c31b42b1553f3942bc3ffa
Signed-off-by: Manojkiran Eda <manojkiran.eda@gmail.com>