fix(deps): update module github.com/jhillyerd/enmime to v0.9.4

Author: renovate[bot]

go.mod

@@ -3,6 +3,6 @@ module github.com/genert/pop3
 go 1.16
 
 require (
-	github.com/jhillyerd/enmime v0.9.2
+	github.com/jhillyerd/enmime v0.9.4
 	github.com/stretchr/testify v1.7.0
 )

go.sum

@@ -10,6 +10,8 @@ github.com/jaytaylor/html2text v0.0.0-20200412013138-3577fbdbcff7 h1:g0fAGBisHaE
 github.com/jaytaylor/html2text v0.0.0-20200412013138-3577fbdbcff7/go.mod h1:CVKlgaMiht+LXvHG173ujK6JUhZXKb2u/BQtjPDIvyk=
 github.com/jhillyerd/enmime v0.9.2 h1:Njvy7yubcX21WaM+kWdVxGFJ99Rk6xHqgon3Ep++qDw=
 github.com/jhillyerd/enmime v0.9.2/go.mod h1:S5ge4lnv/dDDBbAWwtoOFlj14NHiXdw/EqMB2lJz3b8=
+github.com/jhillyerd/enmime v0.9.4 h1:A33NpdcYCiFvTgciDv9D56jetnC8VQuuh7ga8yjy56Y=
+github.com/jhillyerd/enmime v0.9.4/go.mod h1:Qpe8EEemJMFAF8+NZoWdpXvK2Yb9dRF0k/z6mkcDHsA=
 github.com/mattn/go-runewidth v0.0.9/go.mod h1:H031xJmbD/WCDINGzjvQ9THkh0rPKHF+m2gUSrubnMI=
 github.com/mattn/go-runewidth v0.0.12 h1:Y41i/hVW3Pgwr8gV+J23B9YEY0zxjptBuCWEaxmAOow=
 github.com/mattn/go-runewidth v0.0.12/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=