[chore] update viper version (#2539)

* update viper version

* removes our last uses of the slice package

* fix tests

vendor/github.com/subosito/gotenv/gotenv.go

@@ -12,6 +12,9 @@ import (
 	"sort"
 	"strconv"
 	"strings"
+
+	"golang.org/x/text/encoding/unicode"
+	"golang.org/x/text/transform"
 )
 
 const (
@@ -20,9 +23,13 @@ const (
 
 	// Pattern for detecting valid variable within a value
 	variablePattern = `(\\)?(\$)(\{?([A-Z0-9_]+)?\}?)`
+)
 
-	// Byte order mark character
-	bom = "\xef\xbb\xbf"
+// Byte order mark character
+var (
+	bomUTF8    = []byte("\xEF\xBB\xBF")
+	bomUTF16LE = []byte("\xFF\xFE")
+	bomUTF16BE = []byte("\xFE\xFF")
 )
 
 // Env holds key/value pair of valid environment variable
@@ -203,19 +210,40 @@ func splitLines(data []byte, atEOF bool) (advance int, token []byte, err error)
 
 func strictParse(r io.Reader, override bool) (Env, error) {
 	env := make(Env)
-	scanner := bufio.NewScanner(r)
+
+	buf := new(bytes.Buffer)
+	tee := io.TeeReader(r, buf)
+
+	// There can be a maximum of 3 BOM bytes.
+	bomByteBuffer := make([]byte, 3)
+	_, err := tee.Read(bomByteBuffer)
+	if err != nil && err != io.EOF {
+		return env, err
+	}
+
+	z := io.MultiReader(buf, r)
+
+	// We chooes a different scanner depending on file encoding.
+	var scanner *bufio.Scanner
+
+	if bytes.HasPrefix(bomByteBuffer, bomUTF8) {
+		scanner = bufio.NewScanner(transform.NewReader(z, unicode.UTF8BOM.NewDecoder()))
+	} else if bytes.HasPrefix(bomByteBuffer, bomUTF16LE) {
+		scanner = bufio.NewScanner(transform.NewReader(z, unicode.UTF16(unicode.LittleEndian, unicode.ExpectBOM).NewDecoder()))
+	} else if bytes.HasPrefix(bomByteBuffer, bomUTF16BE) {
+		scanner = bufio.NewScanner(transform.NewReader(z, unicode.UTF16(unicode.BigEndian, unicode.ExpectBOM).NewDecoder()))
+	} else {
+		scanner = bufio.NewScanner(z)
+	}
+
 	scanner.Split(splitLines)
 
-	firstLine := true
-
 	for scanner.Scan() {
-		line := strings.TrimSpace(scanner.Text())
-
-		if firstLine {
-			line = strings.TrimPrefix(line, bom)
-			firstLine = false
+		if err := scanner.Err(); err != nil {
+			return env, err
 		}
 
+		line := strings.TrimSpace(scanner.Text())
 		if line == "" || line[0] == '#' {
 			continue
 		}
@@ -263,7 +291,7 @@ func strictParse(r io.Reader, override bool) (Env, error) {
 		}
 	}
 
-	return env, nil
+	return env, scanner.Err()
 }
 
 var (