config: add new child stops to harvard busway config

The Harvard busway has been split into multiple child stops as of the
8/25/2024 rating. This adds those new child stops to the sources config
of the Harvard upper busway sign.

priv/signs.json

@@ -9695,6 +9695,78 @@
             "direction_id": 0
           }
         ]
+      },
+      {
+        "sources": [
+          {
+            "stop_id": 76121,
+            "route_id": 77,
+            "direction_id": 0
+          }
+        ]
+      },
+      {
+        "sources": [
+          {
+            "stop_id": 76122,
+            "route_id": 96,
+            "direction_id": 0
+          }
+        ]
+      },
+      {
+        "sources": [
+          {
+            "stop_id": 76123,
+            "route_id": 66,
+            "direction_id": 0
+          }
+        ]
+      },
+      {
+        "sources": [
+          {
+            "stop_id": 76123,
+            "route_id": 71,
+            "direction_id": 0
+          }
+        ]
+      },
+      {
+        "sources": [
+          {
+            "stop_id": 76123,
+            "route_id": 73,
+            "direction_id": 0
+          }
+        ]
+      },
+      {
+        "sources": [
+          {
+            "stop_id": 76124,
+            "route_id": 74,
+            "direction_id": 0
+          }
+        ]
+      },
+      {
+        "sources": [
+          {
+            "stop_id": 76124,
+            "route_id": 78,
+            "direction_id": 0
+          }
+        ]
+      },
+      {
+        "sources": [
+          {
+            "stop_id": 76125,
+            "route_id": 75,
+            "direction_id": 0
+          }
+        ]
       }
     ],
     "max_minutes": 60