build: Bump NDK API level for RISC-V to 36

Apparently this is needed after this recent NDK roll:
https://chromium-review.googlesource.com/c/chromium/src/+/7797909

Bug: 507812334
Cq-Include-Trybots: luci.chromium.try:android-cronet-x86-dbg-marshmallow-tests
Change-Id: I635d5c50e9419e3b009ae7160bb43bab3b370238
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7807905
Reviewed-by: Devon Loehr <dloehr@google.com>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1623843}
NOKEYCHECK=True
GitOrigin-RevId: 479b97d692bc592f47f36714b80eacda6374e4d2