Send `updated` parameter with `Update` activities

Per the Mastodon docs, this ensures the activity correctly updates posts there.
https://docs.joinmastodon.org/spec/activitypub/#supported-activities-for-statuses

activitypub.go

@@ -718,6 +718,7 @@ func federatePost(app *App, p *PublicPost, collID int64, isUpdate bool) error {
 		// create a new "Create" activity
 		// with our article as object
 		if isUpdate {
+			na.Updated = p.Updated
 			activity = activitystreams.NewUpdateActivity(na)
 		} else {
 			activity = activitystreams.NewCreateActivity(na)

go.mod

@@ -31,7 +31,7 @@ require (
 	github.com/writeas/monday v1.3.0
 	github.com/writeas/saturday v1.7.2-0.20200427193424-392b95a03320
 	github.com/writeas/slug v1.2.0
-	github.com/writeas/web-core v1.6.0
+	github.com/writeas/web-core v1.6.1-0.20231002232751-adbbafe3ee0c
 	github.com/writefreely/go-gopher v0.0.0-20220429181814-40127126f83b
 	github.com/writefreely/go-nodeinfo v1.2.0
 	golang.org/x/crypto v0.13.0

go.sum

@@ -118,8 +118,6 @@ github.com/urfave/cli/v2 v2.25.7 h1:VAzn5oq403l5pHjc4OhD54+XGO9cdKVL/7lDjF+iKUs=
 github.com/urfave/cli/v2 v2.25.7/go.mod h1:8qnjx1vcq5s2/wpsqoZFndg2CE5tNFyrTvS6SinrnYQ=
 github.com/writeas/activity v0.1.2 h1:Y12B5lIrabfqKE7e7HFCWiXrlfXljr9tlkFm2mp7DgY=
 github.com/writeas/activity v0.1.2/go.mod h1:mYYgiewmEM+8tlifirK/vl6tmB2EbjYaxwb+ndUw5T0=
-github.com/writeas/activityserve v0.0.0-20200409150223-d7ab3eaa4481 h1:BiSivIxLQFcKoUorpNN3rNwwFG5bITPnqUSyIccfdh0=
-github.com/writeas/activityserve v0.0.0-20200409150223-d7ab3eaa4481/go.mod h1:4akDJSl+sSp+QhrQKMqzAqdV1gJ1pPx6XPI77zgMM8o=
 github.com/writeas/activityserve v0.0.0-20230428180247-dc13a4f4d835 h1:bm/7gYo6y3GxtTa1qyUFyCk29CTnBAKt7z4D2MASYrw=
 github.com/writeas/activityserve v0.0.0-20230428180247-dc13a4f4d835/go.mod h1:4akDJSl+sSp+QhrQKMqzAqdV1gJ1pPx6XPI77zgMM8o=
 github.com/writeas/go-strip-markdown/v2 v2.1.1 h1:hAxUM21Uhznf/FnbVGiJciqzska6iLei22Ijc3q2e28=
@@ -145,8 +143,8 @@ github.com/writeas/saturday v1.7.2-0.20200427193424-392b95a03320 h1:PozPZ29CQ/xt
 github.com/writeas/saturday v1.7.2-0.20200427193424-392b95a03320/go.mod h1:ETE1EK6ogxptJpAgUbcJD0prAtX48bSloie80+tvnzQ=
 github.com/writeas/slug v1.2.0 h1:EMQ+cwLiOcA6EtFwUgyw3Ge18x9uflUnOnR6bp/J+/g=
 github.com/writeas/slug v1.2.0/go.mod h1:RE8shOqQP3YhsfsQe0L3RnuejfQ4Mk+JjY5YJQFubfQ=
-github.com/writeas/web-core v1.6.0 h1:qOcnbB4RE/kG9g+3ycMRqepj2PljDg2whG/K4A0QB48=
-github.com/writeas/web-core v1.6.0/go.mod h1:7+idL4Y4woF7MnUfNX2mvkaQ8nLIJXths2y5iYPtA3k=
+github.com/writeas/web-core v1.6.1-0.20231002232751-adbbafe3ee0c h1:OcubGLNP26NPbe7s8ppUi8pl1IPKMHZ7Wu+jjxDATBg=
+github.com/writeas/web-core v1.6.1-0.20231002232751-adbbafe3ee0c/go.mod h1:7+idL4Y4woF7MnUfNX2mvkaQ8nLIJXths2y5iYPtA3k=
 github.com/writefreely/go-gopher v0.0.0-20220429181814-40127126f83b h1:h3NzB8OZ50NNi5k9yrFeyFszt3LyqyVK4+xUHFYY8B0=
 github.com/writefreely/go-gopher v0.0.0-20220429181814-40127126f83b/go.mod h1:T2UVVzt+R5KSSZe2xRSytnwc2M9AoDegi7foeIsik+M=
 github.com/writefreely/go-nodeinfo v1.2.0 h1:La+YbTCvmpTwFhBSlebWDDL81N88Qf/SCAvRLR7F8ss=