🎨Only use setuptools-scm-git-archive under < py37

`setuptools-scm` support Git archives natively starting v7 but it only
supports Python 3.7 or higher. This patch makes up a set of
conditional build dependencies that add `setuptools-scm-git-archive`
only below Python 3.7 and in combination with an older version of
`setuptools-scm`. Close #515

.git_archival.txt

@@ -1 +1,4 @@
+node: $Format:%H$
+node-date: $Format:%cI$
+describe-name: $Format:%(describe:tags=true)$
 ref-names: $Format:%D$

pyproject.toml

@@ -6,8 +6,12 @@ requires = [
     "setuptools>=34.4",
 
     # Plugins
-    "setuptools_scm[toml]>=3.5",
-    "setuptools_scm_git_archive>=1.1",
+    "setuptools-scm >= 7.0.0; python_version >= '3.7'",
+    #  ^    supports git archives through a plugin
+    #  |                                        |
+    # supports git archives natively            V
+    "setuptools-scm[toml] >= 3.5, < 7.0.0; python_version < '3.7'",
+    "setuptools-scm-git-archive >= 1.1; python_version < '3.7'",
 ]
 build-backend = "setuptools.build_meta"
 

requirements/dist-build-constraints.in

@@ -5,7 +5,7 @@
 setuptools >= 34.4
 
 # Plugins
-setuptools_scm[toml] >= 3.5
+setuptools_scm[toml] >= 3.5, < 7.0.0; python_version < '3.7'
 setuptools_scm_git_archive >= 1.1
 
 # Dynamic (coming from setuptools' PEP 517 build backend)

requirements/dist-build-constraints.txt

@@ -1,24 +1,14 @@
 #
-# This file is autogenerated by pip-compile with python 3.10
-# To update, run:
+# This file is autogenerated by pip-compile with Python 3.10
+# by the following command:
 #
 #    pip-compile --allow-unsafe --output-file=requirements/dist-build-constraints.txt --strip-extras requirements/dist-build-constraints.in
 #
-packaging==21.3
-    # via setuptools-scm
-pyparsing==3.0.6
-    # via packaging
-setuptools-scm==6.3.2
-    # via -r requirements/dist-build-constraints.in
 setuptools-scm-git-archive==1.1
     # via -r requirements/dist-build-constraints.in
-tomli==2.0.0
-    # via setuptools-scm
 wheel==0.37.1
     # via -r requirements/dist-build-constraints.in
 
 # The following packages are considered to be unsafe in a requirements file:
 setuptools==60.2.0
-    # via
-    #   -r requirements/dist-build-constraints.in
-    #   setuptools-scm
+    # via -r requirements/dist-build-constraints.in

setup.cfg

@@ -64,8 +64,8 @@ include_package_data = True
 
 # These are required during `setup.py` run:
 setup_requires =
-  setuptools_scm>=1.15.0
-  setuptools_scm_git_archive>=1.0
+  setuptools_scm>=1.15.0; python_version =< '3.6'"
+  setuptools_scm>= 7.0.0; python_version >= '3.7'"
 
 # These are required in actual runtime:
 install_requires =