refactor: replace strings.Replace with strings.ReplaceAll (#15392)

strings.ReplaceAll(s, old, new) is a wrapper function for
strings.Replace(s, old, new, -1). But strings.ReplaceAll is more
readable and removes the hardcoded -1.

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

plugins/database/postgresql/postgresql.go

@@ -482,7 +482,7 @@ func containsMultilineStatement(stmt string) bool {
 	}
 	stmtWithoutLiterals := stmt
 	for _, literal := range literals {
-		stmtWithoutLiterals = strings.Replace(stmt, literal, "", -1)
+		stmtWithoutLiterals = strings.ReplaceAll(stmt, literal, "")
 	}
 	// Now look for the word "END" specifically. This will miss any
 	// representations of END that aren't surrounded by spaces, but