Rebuild for PyPy3.7 for windows

.ci_support/migrations/pypy37-windows.yaml

@@ -0,0 +1,33 @@
+migrator_ts: 1623865877
+__migrator:
+    migration_number: 1
+    operation: key_add
+    primary_key: python
+    ordering:
+        python:
+            - 3.6.* *_cpython
+            - 3.7.* *_cpython
+            - 3.8.* *_cpython
+            - 3.9.* *_cpython
+            - 3.6.* *_73_pypy
+            - 3.7.* *_73_pypy  # new entry
+    paused: False
+    longterm: True
+    pr_limit: 6
+    bump_number: 0
+    wait_for_migrators:
+      - pypy37
+    commit_message: "Rebuild for PyPy3.7 for windows"
+    exclude:
+      # this shouldn't attempt to modify the python feedstocks
+      - python
+      - pypy3.6
+      - pypy-meta
+
+python:                # [win]
+  - 3.7.* *_73_pypy    # [win]
+# additional entries to add for zip_keys
+numpy:                 # [win]
+  - 1.19               # [win]
+python_impl:           # [win]
+  - pypy               # [win]

.ci_support/win_64_python3.7.____73_pypy.yaml

@@ -0,0 +1,16 @@
+c_compiler:
+- vs2019
+channel_sources:
+- conda-forge,defaults
+channel_targets:
+- conda-forge main
+cxx_compiler:
+- vs2019
+pin_run_as_build:
+  python:
+    min_pin: x.x
+    max_pin: x.x
+python:
+- 3.7.* *_73_pypy
+target_platform:
+- win-64