patch 8.2.0798: libvterm code lags behind the upstream version

Problem:    Libvterm code lags behind the upstream version.
Solution:   Include revisions 755 - 758.
diff --git a/src/libvterm/t/29state_fallback.test b/src/libvterm/t/29state_fallback.test
index adf1c23..7995dd1 100644
--- a/src/libvterm/t/29state_fallback.test
+++ b/src/libvterm/t/29state_fallback.test
@@ -12,8 +12,8 @@
 
 !Unrecognised OSC
 PUSH "\e]27;Something\e\\"
-  osc "27;Something"
+  osc [27 "Something"]
 
 !Unrecognised DCS
 PUSH "\ePz123\e\\"
-  dcs "z123"
+  dcs ["z123"]