Bump SDK to fe6154c8b320 (fix empty ID array handling) (#351)

Picks up basecamp/basecamp-sdk#207 which fixes update methods
silently dropping empty ID slices. Previously, unassigning the
last assignee/participant/subscriber had no effect because the
SDK omitted the empty array from the request body.

Author: robzolkos

go.mod

@@ -6,7 +6,7 @@ require (
 	charm.land/bubbles/v2 v2.0.0
 	charm.land/bubbletea/v2 v2.0.2
 	charm.land/lipgloss/v2 v2.0.2
-	github.com/basecamp/basecamp-sdk/go v0.6.1-0.20260319050216-1c33ce43c305
+	github.com/basecamp/basecamp-sdk/go v0.6.1-0.20260320103941-fe6154c8b320
 	github.com/basecamp/cli v0.1.1
 	github.com/charmbracelet/bubbles v1.0.0
 	github.com/charmbracelet/glamour v1.0.0

go.sum

@@ -23,8 +23,8 @@ github.com/aymanbagabas/go-udiff v0.4.1 h1:OEIrQ8maEeDBXQDoGCbbTTXYJMYRCRO1fnodZ
 github.com/aymanbagabas/go-udiff v0.4.1/go.mod h1:0L9PGwj20lrtmEMeyw4WKJ/TMyDtvAoK9bf2u/mNo3w=
 github.com/aymerick/douceur v0.2.0 h1:Mv+mAeH1Q+n9Fr+oyamOlAkUNPWPlA8PPGR0QAaYuPk=
 github.com/aymerick/douceur v0.2.0/go.mod h1:wlT5vV2O3h55X9m7iVYN0TBM0NH/MmbLnd30/FjWUq4=
-github.com/basecamp/basecamp-sdk/go v0.6.1-0.20260319050216-1c33ce43c305 h1:NuMRr9mXUhSZAxxxLLfOAhiCTeYDlt/h7HaoarRLGjk=
-github.com/basecamp/basecamp-sdk/go v0.6.1-0.20260319050216-1c33ce43c305/go.mod h1:g05DM58QkUm4/mvBAvRiugPw+F4trliuGkRGg8y+Th4=
+github.com/basecamp/basecamp-sdk/go v0.6.1-0.20260320103941-fe6154c8b320 h1:xHbqMcj57XgSb69wsy+dhTzZ+p3IYb/BnjisI9NF5c4=
+github.com/basecamp/basecamp-sdk/go v0.6.1-0.20260320103941-fe6154c8b320/go.mod h1:g05DM58QkUm4/mvBAvRiugPw+F4trliuGkRGg8y+Th4=
 github.com/basecamp/cli v0.1.1 h1:FAF3M09xo1m7gJJXf38glCkT50ZUuvz+31f+c3R3zcc=
 github.com/basecamp/cli v0.1.1/go.mod h1:NTHe+keCTGI2qM5sMXdkUN0QgU3zGbwnBxcmg8vD5QU=
 github.com/bmatcuk/doublestar v1.1.1/go.mod h1:UD6OnuiIn0yFxxA2le/rnRU1G4RaI4UvFv1sNto9p6w=

internal/version/sdk-provenance.json

@@ -1,9 +1,9 @@
 {
   "sdk": {
     "module": "github.com/basecamp/basecamp-sdk/go",
-    "version": "v0.6.1-0.20260319050216-1c33ce43c305",
-    "revision": "1c33ce43c305",
-    "updated_at": "2026-03-19T05:02:16Z"
+    "version": "v0.6.1-0.20260320103941-fe6154c8b320",
+    "revision": "fe6154c8b320",
+    "updated_at": "2026-03-20T10:39:41Z"
   },
   "api": {
     "repo": "basecamp/bc3",