Reflect embedded WG leadership change

James Munns stepped down from the embedded WG leadership and Adam Greig
will take over.

CC rust-embedded/wg#463

Signed-off-by: Daniel Egger <daniel@eggers-club.de>

Author: therealprof

teams/wg-embedded.toml

@@ -2,7 +2,7 @@ name = "wg-embedded"
 wg = true
 
 [people]
-leads = ["japaric", "therealprof", "jamesmunns"]
+leads = ["adamgreig", "japaric", "therealprof"]
 members = [
     "adamgreig",
     "almindor",