Update healthcheck target URL to Facebook's Tor onion service V3

Onion service v2 is deprecated, see:
- https://blog.torproject.org/v2-deprecation-timeline

Facebook onion service reference:
- https://www.facebook.com/onion-service
- https://en.wikipedia.org/wiki/Facebook_onion_address

Dockerfile

@@ -13,7 +13,7 @@ RUN echo '@edge http://dl-cdn.alpinelinux.org/alpine/edge/community' >> /etc/apk
 COPY --chown=tor:root torrc /etc/tor/
 
 HEALTHCHECK --timeout=10s --start-period=60s \
-    CMD curl --fail --socks5-hostname localhost:9150 -I -L 'https://www.facebookcorewwwi.onion/' || exit 1
+    CMD curl --fail --socks5-hostname localhost:9150 -I -L 'https://www.facebookwkhpilnemxj7asaniu7vnjjbiltxjqhye3mhbshg7kx5tfyd.onion/' || exit 1
 
 USER tor
 EXPOSE 8853/udp 9150/tcp