add missing numpy in recipe

pkg/env/dtk-imaging-python.yaml

@@ -9,3 +9,4 @@ dependencies:
     - dtk-imaging >=2.0.0
     - dtk-script >=2.3.0
     - swig >=4.0.1
+    - numpy

pkg/recipe/meta.yaml

@@ -6,7 +6,7 @@ source:
   git_url:     ../..
 
 build:
-  number:      0
+  number:      1
 
 requirements:
   build:
@@ -48,6 +48,7 @@ requirements:
     - dtk-imaging >=2.0.1,<2.1.0
     - dtk-script >=2.3.1,<2.4.0
     - swig >=4.0.1
+    - numpy
 
   run:
     - qt >=5.9.0
@@ -56,6 +57,7 @@ requirements:
     - dtk-core-python >=2.5.3,<2.6.0
     - dtk-imaging >=2.0.1,<2.1.0
     - dtk-script >=2.3.1,<2.4.0
+    - numpy
 
 about:
   home: https://gitlab.inria.fr/dtk/dtk-script