Update builder-web opam file

- Depend on tar, opam-graph, modulectomy
- Add pin-depends on opam-graph, modulectomy

packages/builder-web.0.2.0~dev/opam

@@ -47,6 +47,9 @@ depends: [
   "uri"
   "fmt" {>= "0.8.7"}
   "omd"
+  "modulectomy"
+  "opam-graph"
+  "tar"
 ]
 
 synopsis: "Web interface for builder"
@@ -55,6 +58,11 @@ Builder-web takes in submissions of builds, typically from [builder](https://git
 Produced binaries can be downloaded and executed.
 [builds.robur.coop](https://builds.robur.coop/) itself runs builder-web.
 """
+
+pin-depends: [
+  ["modulectomy.dev" "git+https://github.com/roburio/modulectomy.git#20211213_implementing_UI_scale_in_modulectomy.treemap"]
+  ["opam-graph.dev" "git+https://git.robur.io/robur/opam-graph.git"]
+]
 url {
   src: "git+https://git.robur.io/robur/builder-web.git"
 }