systemddbus: go-systemd/v22/dbus deprecated function

Update systemd-go library

```
got get github.com/coreos/go-systemd/v22/dbus@latest
go mod vendor
go mod tidy
```

And replace sdconn.SubscribeUnitsCustom with
sdconn.SubscribeUnitsCustomContext in kolet.go

This fixes the following error:

SA1019: sdconn.SubscribeUnitsCustom is deprecated:
use SubscribeUnitsCustomContext instead.  (staticcheck)

Author: angelcerveraroldan

go.mod

@@ -26,7 +26,7 @@ require (
 	github.com/coreos/butane v0.25.1
 	github.com/coreos/go-semver v0.3.1
 	github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e
-	github.com/coreos/go-systemd/v22 v22.6.0
+	github.com/coreos/go-systemd/v22 v22.7.0
 	github.com/coreos/ignition/v2 v2.25.0
 	github.com/coreos/pkg v0.0.0-20240122114842-bbd7aa9bf6fb
 	github.com/coreos/rpmostree-client-go v0.0.0-20240514234259-72a33e8554b6

go.sum

@@ -112,8 +112,8 @@ github.com/coreos/go-semver v0.3.1 h1:yi21YpKnrx1gt5R+la8n5WgS0kCrsPp33dmEyHReZr
 github.com/coreos/go-semver v0.3.1/go.mod h1:irMmmIw/7yzSRPWryHsK7EYSg09caPQL03VsM8rvUec=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e h1:Wf6HqHfScWJN9/ZjdUKyjop4mf3Qdd+1TvvltAvM3m8=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
-github.com/coreos/go-systemd/v22 v22.6.0 h1:aGVa/v8B7hpb0TKl0MWoAavPDmHvobFe5R5zn0bCJWo=
-github.com/coreos/go-systemd/v22 v22.6.0/go.mod h1:iG+pp635Fo7ZmV/j14KUcmEyWF+0X7Lua8rrTWzYgWU=
+github.com/coreos/go-systemd/v22 v22.7.0 h1:LAEzFkke61DFROc7zNLX/WA2i5J8gYqe0rSj9KI28KA=
+github.com/coreos/go-systemd/v22 v22.7.0/go.mod h1:xNUYtjHu2EDXbsxz1i41wouACIwT7Ybq9o0BQhMwD0w=
 github.com/coreos/ignition/v2 v2.25.0 h1:4TboIy9z2ofMZmIv5ypyXCFTeKjPNwE5mQNpgkJLdMM=
 github.com/coreos/ignition/v2 v2.25.0/go.mod h1:L8tzd8rDzGMKtEvJ22Rk41jW5chE50sDK5Rn/8C1JsE=
 github.com/coreos/pkg v0.0.0-20240122114842-bbd7aa9bf6fb h1:GIzvVQ9UkUlOhSDlqmrQAAAUd6R3E+caIisNEyWXvNE=

mantle/cmd/kolet/kolet.go

@@ -403,7 +403,7 @@ func runExtUnit(cmd *cobra.Command, args []string) error {
 		return n != unitname
 	}
 	compareFunc := func(u1, u2 *systemddbus.UnitStatus) bool { return *u1 != *u2 }
-	unitevents, uniterrs := sdconn.SubscribeUnitsCustom(time.Second, 0, compareFunc, filterFunc)
+	unitevents, uniterrs := sdconn.SubscribeUnitsCustomContext(ctx, time.Second, 0, compareFunc, filterFunc)
 
 	for {
 		systemdjournal.Print(systemdjournal.PriInfo, "Awaiting events")