ENH: Python packages against v5.1.1.post1 for 3.9 support

Author: thewtex

.github/workflows/build-test-package.yml

@@ -137,7 +137,7 @@ jobs:
       matrix:
         python-version: [36, 37, 38]
         include:
-          - itk-python-git-tag: "v5.1.1"
+          - itk-python-git-tag: "v5.1.1.post1"
 
     steps:
     - uses: actions/checkout@v2
@@ -181,7 +181,7 @@ jobs:
       max-parallel: 2
       matrix:
         include:
-          - itk-python-git-tag: "v5.1.1"
+          - itk-python-git-tag: "v5.1.1.post1"
 
     steps:
     - uses: actions/checkout@v2
@@ -218,7 +218,7 @@ jobs:
       matrix:
         python-version-minor: [6, 7, 8]
         include:
-          - itk-python-git-tag: "v5.1.1"
+          - itk-python-git-tag: "v5.1.1.post1"
 
     steps:
     - uses: actions/checkout@v2

{{cookiecutter.project_name}}/.github/workflows/build-test-package.yml

@@ -130,7 +130,7 @@ jobs:
       matrix:
         python-version: [36, 37, 38]
         include:
-          - itk-python-git-tag: "v5.1.1"
+          - itk-python-git-tag: "v5.1.1.post1"
 
     steps:
     - uses: actions/checkout@v2
@@ -166,7 +166,7 @@ jobs:
       max-parallel: 2
       matrix:
         include:
-          - itk-python-git-tag: "v5.1.1"
+          - itk-python-git-tag: "v5.1.1.post1"
 
     steps:
     - uses: actions/checkout@v2
@@ -195,7 +195,7 @@ jobs:
       matrix:
         python-version-minor: [6, 7, 8]
         include:
-          - itk-python-git-tag: "v5.1.1"
+          - itk-python-git-tag: "v5.1.1.post1"
 
     steps:
     - uses: actions/checkout@v2