Revert "CC-796: Remove dependency on unsupported version of go-oidc"

This reverts commit 0899d6a136.

vendor/gopkg.in/square/go-jose.v2/encoding.go

@@ -23,12 +23,13 @@ import (
 	"encoding/binary"
 	"io"
 	"math/big"
-	"strings"
-	"unicode"
+	"regexp"
 
 	"gopkg.in/square/go-jose.v2/json"
 )
 
+var stripWhitespaceRegex = regexp.MustCompile("\\s")
+
 // Helper function to serialize known-good objects.
 // Precondition: value is not a nil pointer.
 func mustSerializeJSON(value interface{}) []byte {
@@ -55,14 +56,7 @@ func mustSerializeJSON(value interface{}) []byte {
 
 // Strip all newlines and whitespace
 func stripWhitespace(data string) string {
-	buf := strings.Builder{}
-	buf.Grow(len(data))
-	for _, r := range data {
-		if !unicode.IsSpace(r) {
-			buf.WriteRune(r)
-		}
-	}
-	return buf.String()
+	return stripWhitespaceRegex.ReplaceAllString(data, "")
 }
 
 // Perform compression based on algorithm