ci: bump to go 1.20 (#375)

* Update CI Go version to 1.20/1.19
* Update `golangci-lint` to v1.51.2
* Update coverage collection to use new Go 1.20 tools
* Update coverage job to only run on latest Go version

Fixes #367

internal/gen/mov.go

@@ -17,7 +17,7 @@ type mov struct {
 }
 
 // NewMOV generates a function that will auto-select the correct MOV instruction
-// based on operand types and and sizes.
+// based on operand types and sizes.
 func NewMOV(cfg printer.Config) Interface {
 	return GoFmt(&mov{cfg: cfg})
 }