Deps update, gopkg.lock fix, flagger initialization fix.

vendor/golang.org/x/crypto/tea/cipher.go

@@ -5,6 +5,14 @@
 // Package tea implements the TEA algorithm, as defined in Needham and
 // Wheeler's 1994 technical report, “TEA, a Tiny Encryption Algorithm”. See
 // http://www.cix.co.uk/~klockstone/tea.pdf for details.
+//
+// TEA is a legacy cipher and its short block size makes it vulnerable to
+// birthday bound attacks (see https://sweet32.info). It should only be used
+// where compatibility with legacy systems, not security, is the goal.
+//
+// Deprecated: any new system should use AES (from crypto/aes, if necessary in
+// an AEAD mode like crypto/cipher.NewGCM) or XChaCha20-Poly1305 (from
+// golang.org/x/crypto/chacha20poly1305).
 package tea
 
 import (