update ss(nm)g splits

1.16-1.21 -> 1.16-1.19, 1.20-1.21
1.9-1.12, 1.13-1.15 -> 1.9-1.13, 1.14-1.15

Author: tildejustin

rules.typ

@@ -826,13 +826,13 @@ H.1.2) In set seed runs, intentional prerotation (spawning into the world rotate
 1.6.2) Runs under 23 minutes must submit world files, logs, and gameplay audio.\
 1.6.3) Runs under 23 minutes will be retimed as per top-level retiming rules.
 
-== 1.7: Set Seed, 1.16+
+== 1.7: Set Seed, 1.16-1.19
 1.7.1) Runs under 1:50 must submit world files, logs, and gameplay audio.
 
-== 1.8: Set Seed, 1.13-1.15
+== 1.8: Set Seed, 1.14-1.15
 1.8.1) Runs under 2:45 must submit world files and logs.
 
-== 1.9: Set Seed, 1.9-1.12
+== 1.9: Set Seed, 1.9-1.13
 1.9.1) Runs under 1:00 must submit world files and logs.
 
 == 1.10: Set Seed, 1.8
@@ -841,6 +841,9 @@ H.1.2) In set seed runs, intentional prerotation (spawning into the world rotate
 == 1.11: Set Seed, Pre 1.8
 1.11.1) Runs under 4:15 must submit world files and logs.
 
+== 1.12: Set Seed, 1.20+
+1.7.1) Runs under 1:45 must submit world files, logs, and gameplay audio.
+
 = 2: Any%
 
 == 2.1: Any% Objective and Clarifications