stm32/tests: disable stop test.

.github/ci/build.sh

@@ -12,7 +12,6 @@ if [ -f /ci/secrets/teleprobe-token.txt ]; then
     export TELEPROBE_HOST=https://teleprobe.embassy.dev
     export TELEPROBE_TOKEN=$(cat /ci/secrets/teleprobe-token.txt)
     export TELEPROBE_CACHE=/ci/cache/teleprobe_cache.json
-    rm -f $TELEPROBE_CACHE
 fi
 
 # needed for "dumb HTTP" transport support

ci.sh

@@ -218,6 +218,9 @@ cargo batch  \
 rm out/tests/stm32wb55rg/wpan_mac
 rm out/tests/stm32wb55rg/wpan_ble
 
+# unstable
+rm out/tests/stm32f429zi/stop
+
 # unstable, I think it's running out of RAM?
 rm out/tests/stm32f207zg/eth