Update expressions/parser.go

Co-authored-by: Copilot <[email protected]>

Author: osteele

expressions/parser.go

@@ -1,5 +1,5 @@
 //go:generate ragel -Z scanner.rl
-//go:generate sh -c "echo '// Code generated by ragel. DO NOT EDIT.' > scanner.tmp && cat scanner.go >> scanner.tmp && mv scanner.tmp scanner.go"
+//go:generate sed -i '1i// Code generated by ragel. DO NOT EDIT.' scanner.go
 //go:generate goyacc expressions.y
 
 package expressions