scripted-diff: rename vRecvGetData

Summary:

-BEGIN VERIFY SCRIPT-
sed -i 's/vRecvGetData/m_getdata_requests/g' src/net_processing.cpp
-END VERIFY SCRIPT-

This is a backport of core#19911 [6/6]
https://github.com/bitcoin/bitcoin/pull/19911/commits/da0988daf1d665a4644ad3f1ddf3f8a8bdd88cde

Depends on D10530

Test Plan: ninja all check-all

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D10531