cli/command/formatter: add missing go:build tag

Seen failing when used elsewhere;

    vendor/github.com/docker/cli/cli/command/formatter/displayutils.go:78:20: predeclared any requires go1.18 or later (-lang was set to go1.16; check go.mod)

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

Author: thaJeztah

cli/command/formatter/displayutils.go

@@ -1,3 +1,6 @@
+// FIXME(thaJeztah): remove once we are a module; the go:build directive prevents go from downgrading language version to go1.16:
+//go:build go1.22
+
 package formatter
 
 import (