chore(go): go-openapi requires go.1.20 across the board

Signed-off-by: Frederic BIDON <fredbi@yahoo.com>

go.mod

@@ -14,4 +14,4 @@ require (
 	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 )
 
-go 1.19
+go 1.20

string_bytes.go

@@ -2,21 +2,7 @@ package swag
 
 import "unsafe"
 
-type internalString struct {
-	Data unsafe.Pointer
-	Len  int
-}
-
 // hackStringBytes returns the (unsafe) underlying bytes slice of a string.
-func hackStringBytes(str string) []byte {
-	p := (*internalString)(unsafe.Pointer(&str)).Data
-	return unsafe.Slice((*byte)(p), len(str))
-}
-
-/*
- * go1.20 version (for when go mod moves to a go1.20 requirement):
-
 func hackStringBytes(str string) []byte {
 	return unsafe.Slice(unsafe.StringData(str), len(str))
 }
-*/