contrib: make-seeds updates for 23.x

Documentation:

- Use https URL for bitcoin.sipa.be (http sends a redirect, fooling
curl).
- Add explicit step to add manual seeds.

Code:

- Change PATTERN_ONION to v3 (effectively means that the no onion hosts
are delivered).
- Add versions to PATTERN_AGENT filter.
- Print specific message on resolve exception.

contrib/seeds/README.md

@@ -10,8 +10,9 @@ to addrman with).
 
 The seeds compiled into the release are created from sipa's DNS seed data, like this:
 
-    curl -s http://bitcoin.sipa.be/seeds.txt.gz | gzip -dc > seeds_main.txt
+    curl https://bitcoin.sipa.be/seeds.txt.gz | gzip -dc > seeds_main.txt
     python3 makeseeds.py < seeds_main.txt > nodes_main.txt
+    cat nodes_main_manual.txt >> nodes_main.txt
     python3 generate-seeds.py . > ../../src/chainparamsseeds.h
 
 ## Dependencies