net: Hardcoded seeds update for 0.20

Update hardcoded seeds from seeds_emzy.txt seeds_lukejr.txt
seeds_sipa.txt seeds_sjors.txt, according to release process.

Output from makeseeds.py:
```
  IPv4   IPv6  Onion Pass
1364173 244127   2454 Initial
1364173 244127   2454 Skip entries with invalid address
1129552 213117   2345 After removing duplicates
1129548 213117   2345 Skip entries from suspicious hosts
338216 191944   2249 Enforce minimal number of blocks
336851 188993   2189 Require service bit 1
  6998   1520    150 Require minimum uptime
  5682   1290     89 Require a known and recent user agent
  5622   1279     89 Filter out hosts with multiple bitcoin ports
   512    146     89 Look up ASNs and limit results per ASN and per net
```

contrib/seeds/makeseeds.py

@@ -33,7 +33,8 @@ PATTERN_AGENT = re.compile(
     r"0.16.(0|1|2|3|99)|"
     r"0.17.(0|0.1|1|2|99)|"
     r"0.18.(0|1|99)|"
-    r"0.19.99"
+    r"0.19.(0|1|99)|"
+    r"0.20.99"
     r")")
 
 def parseline(line):