Check out a working version of riscv-tests.

riscv-software-src/riscv-tests#489 doesn't play
nice with github workflow somehow.

Change-Id: I6efa612a085cee3b64a5e4e58408de202069c045
Signed-off-by: Tim Newsome <tim@sifive.com>

.github/workflows/spike-openocd-tests.yml

@@ -6,7 +6,8 @@ env:
   SPIKE_REPO: https://github.com/riscv-software-src/riscv-isa-sim.git
   SPIKE_REV: master
   RISCV_TESTS_REPO: https://github.com/riscv-software-src/riscv-tests.git
-  RISCV_TESTS_REV: master
+  # TODO: change RISCV_TESTS_REV to `master`
+  RISCV_TESTS_REV: disable_unavailable
   TOOLCHAIN_URL: https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases/download/v12.2.0-1/xpack-riscv-none-elf-gcc-12.2.0-1-linux-x64.tar.gz
 
 on: pull_request