chore: Upgrade taskgraph version to 7.3.1

.taskcluster.yml

@@ -192,7 +192,6 @@ tasks:
                                     ${normProjectUpper}_HEAD_REF: '${short_head_ref}'
                                     ${normProjectUpper}_HEAD_REV: '${head_sha}'
                                     ${normProjectUpper}_REPOSITORY_TYPE: git
-                                    ${normProjectUpper}_PIP_REQUIREMENTS: taskcluster/requirements.txt
                                     REPOSITORIES:
                                         $json:
                                             ${normProject}: ${normProject}
@@ -212,7 +211,7 @@ tasks:
                           features:
                               taskclusterProxy: true
 
-                          image: mozillareleases/taskgraph:decision-c4ac262880970ca484105929e02dd12f00214d5f2603ab6ce4c0d17de5cd0280@sha256:2dd667994aa13fccdcdcede85c570a5eb4a5247e42875a9e95a135ef774ee469
+                          image: mozillareleases/taskgraph:decision-v7.3.1@sha256:1d1364c01c13002a13863f0ef27dd7331ad1c7fe92bbb8b0b4019dc5a821461c
                           maxRunTime: 1800
 
                           command:
@@ -229,11 +228,11 @@ tasks:
                                         cd /builds/worker/checkouts/src &&
                                         ln -s /builds/worker/artifacts artifacts &&
                                         pip3 install -r requirements/base.txt &&
-                                        ~/.local/bin/taskgraph action-callback
+                                        taskgraph action-callback
                                     else: >
                                         cd /builds/worker/checkouts/src &&
                                         ln -s /builds/worker/artifacts artifacts &&
-                                        ~/.local/bin/taskgraph decision
+                                        taskgraph decision
                                         --pushlog-id='0'
                                         --pushdate='0'
                                         --project='${project}'