add more //go:build directives to prevent downgrading to go1.16 language

This is a follow-up to 2cf2309, adding
more directives to adjust for some new code added since:

Before this patch:

    make -C ./internal/gocompat/
    GO111MODULE=off go generate .
    GO111MODULE=on go mod tidy
    GO111MODULE=on go test -v

    # github.com/docker/docker/internal/sliceutil
    internal/sliceutil/sliceutil.go:3:12: type parameter requires go1.18 or later (-lang was set to go1.16; check go.mod)
    internal/sliceutil/sliceutil.go:3:14: predeclared comparable requires go1.18 or later (-lang was set to go1.16; check go.mod)
    internal/sliceutil/sliceutil.go:4:19: invalid map key type T (missing comparable constraint)

    # github.com/docker/docker/libnetwork
    libnetwork/endpoint.go:252:17: implicit function instantiation requires go1.18 or later (-lang was set to go1.16; check go.mod)

    # github.com/docker/docker/daemon
    daemon/container_operations.go:682:9: implicit function instantiation requires go1.18 or later (-lang was set to go1.16; check go.mod)
    daemon/inspect.go:42:18: implicit function instantiation requires go1.18 or later (-lang was set to go1.16; check go.mod)

With this patch:

    make -C ./internal/gocompat/
    GO111MODULE=off go generate .
    GO111MODULE=on go mod tidy
    GO111MODULE=on go test -v
    === RUN   TestModuleCompatibllity
        main_test.go:321: all packages have the correct go version specified through //go:build
    --- PASS: TestModuleCompatibllity (0.00s)
    PASS
    ok  	gocompat	0.031s
    make: Leaving directory '/go/src/github.com/docker/docker/internal/gocompat'

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit bd4ff31)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

daemon/container_operations.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 go1.19
+
 package daemon // import "github.com/docker/docker/daemon"
 
 import (

daemon/inspect.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 go1.19
+
 package daemon // import "github.com/docker/docker/daemon"
 
 import (

internal/sliceutil/sliceutil.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 go1.19
+
 package sliceutil
 
 func Dedup[T comparable](slice []T) []T {

libnetwork/endpoint.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 go1.19
+
 package libnetwork
 
 import (