PEP 11: Add 64-bit RPi support to Tier 3 (#4647)

Author: savannahostrowski

peps/pep-0011.rst

@@ -124,6 +124,7 @@ aarch64-pc-windows-msvc                                      Steve Dower
 arm64-apple-ios                  iOS on device               Russell Keith-Magee, Ned Deily
 arm64-apple-ios-simulator        iOS on M1 macOS simulator   Russell Keith-Magee, Ned Deily
 armv7l-unknown-linux-gnueabihf   32-bit Raspberry Pi OS, gcc Gregory P. Smith
+aarch64-unknown-linux-gnu        64-bit Raspberry Pi OS, gcc Savannah Ostrowski
 powerpc64le-unknown-linux-gnu    glibc, clang                Victor Stinner
 
                                  glibc, gcc                  Victor Stinner