Point numpy version to <1.20.3 (aws#2868)

* Point numpy version to <1.19 to avoid PEP 317 failure

* Update integ test python requirements which contain numpy

* Fixing to numpy 1.20.2

* Revert "Fixing to numpy 1.20.2"

This reverts commit a03f4d7.

* Fixing numpy version to <1.20.3

tests/integration/testdata/buildcmd/PyLayer/requirements.txt

@@ -1,6 +1,7 @@
 # These are some hard packages to build. Using them here helps us verify that building works on various platforms
 
-numpy~=1.15
+# NOTE: Fixing to <1.20.3 as numpy1.20.3 started to use a new wheel naming convention (PEP 600)
+numpy<1.20.3
 # `cryptography` has a dependency on `pycparser` which, for some reason doesn't build inside a Docker container.
 # Turning this off until we resolve this issue: https://github.com/awslabs/aws-lambda-builders/issues/29
 # cryptography~=2.4

tests/integration/testdata/buildcmd/PyLayerMake/requirements.txt

@@ -1,6 +1,7 @@
 # These are some hard packages to build. Using them here helps us verify that building works on various platforms
 
-numpy~=1.15
+# NOTE: Fixing to <1.20.3 as numpy1.20.3 started to use a new wheel naming convention (PEP 600)
+numpy<1.20.3
 # `cryptography` has a dependency on `pycparser` which, for some reason doesn't build inside a Docker container.
 # Turning this off until we resolve this issue: https://github.com/awslabs/aws-lambda-builders/issues/29
 # cryptography~=2.4

tests/integration/testdata/buildcmd/Python/requirements.txt

@@ -1,6 +1,7 @@
 # These are some hard packages to build. Using them here helps us verify that building works on various platforms
 
-numpy~=1.15
+# NOTE: Fixing to <1.20.3 as numpy1.20.3 started to use a new wheel naming convention (PEP 600)
+numpy<1.20.3
 # `cryptography` has a dependency on `pycparser` which, for some reason doesn't build inside a Docker container.
 # Turning this off until we resolve this issue: https://github.com/awslabs/aws-lambda-builders/issues/29
 # cryptography~=2.4

tests/integration/testdata/buildcmd/PythonImage/requirements.txt

@@ -1,6 +1,7 @@
 # These are some hard packages to build. Using them here helps us verify that building works on various platforms
 
-numpy~=1.15
+# NOTE: Fixing to <1.20.3 as numpy1.20.3 started to use a new wheel naming convention (PEP 600)
+numpy<1.20.3
 # `cryptography` has a dependency on `pycparser` which, for some reason doesn't build inside a Docker container.
 # Turning this off until we resolve this issue: https://github.com/awslabs/aws-lambda-builders/issues/29
 # cryptography~=2.4