build: Bump github.com/docker/go-units to 0.5.0

... to improve performance by not using regular expressions [1].
However, the potential reduction in binary size is lost because Toolbx
already uses the 'regexp' package to check if a string might be the ID
of an image or a valid container name.

[1] go-units commit 737572633c434ce2
    docker/go-units@737572633c434ce2
    docker/go-units#40

src/go.mod

@@ -6,7 +6,7 @@ require (
 	github.com/HarryMichal/go-version v1.0.1
 	github.com/acobaugh/osrelease v0.1.0
 	github.com/briandowns/spinner v1.17.0
-	github.com/docker/go-units v0.4.0
+	github.com/docker/go-units v0.5.0
 	github.com/fsnotify/fsnotify v1.5.1
 	github.com/godbus/dbus/v5 v5.0.6
 	github.com/sirupsen/logrus v1.8.1

src/go.sum

@@ -97,8 +97,8 @@ github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46t
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/docker/go-units v0.4.0 h1:3uh0PgVws3nIA0Q+MwDC8yjEPf9zjRfZZWXZYDct3Tw=
-github.com/docker/go-units v0.4.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
+github.com/docker/go-units v0.5.0 h1:69rxXcBk27SvSaaxTtLh/8llcHD8vYHT7WSdRZ/jvr4=
+github.com/docker/go-units v0.5.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk=
 github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
 github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=