Update dependencies and fix CI

* nanopb 0.4.6.4 with PB_C99_STATIC_ASSERT to avoid depending on C11
* OpenSSL 1.1.1q on windows
* Switched from docker to podman in CI
* Appdir in appimage build container is now in /build/appdir to fix
  "Invalid cross-device link" errors in linuxdeploy when appdir is in
  mount
* Use python protobuf==3.19.5 in bionic image, which still supports
  python 3.6, and on windows where nanopb otherwise has issues
* Purge nanopb_pb2.py to force regeneration of it for possibly different
  python protobuf versions in subsequent builds
* FreeBSD needs py39 packages now

scripts/switch/build.sh

@@ -16,6 +16,9 @@ build_chiaki (){
 	pushd "${BASEDIR}"
 		#rm -rf ./build
 
+		# purge leftover proto/nanopb_pb2.py which may have been created with another protobuf version
+		rm -fv third-party/nanopb/generator/proto/nanopb_pb2.py
+
 		cmake -B "${build}" \
 			-GNinja \
 			-DCMAKE_TOOLCHAIN_FILE=${toolchain} \

scripts/switch/run-podman-build-chiaki.sh

@@ -2,7 +2,7 @@
 
 cd "`dirname $(readlink -f ${0})`/../.."
 
-docker run \
+podman run \
 	-v "`pwd`:/build/chiaki" \
 	-w "/build/chiaki" \
 	-t \