automation: delete code related to Python 2.7 support

The building of Inno and WiX installers took a python_version argument
that allowed us to specify "2" or "3" for the major Python version. Since
we no longer support Python 2, we can delete this argument and everything
feeding into it.

Differential Revision: https://phab.mercurial-scm.org/D12264

contrib/automation/hgautomation/cli.py

@@ -65,7 +65,6 b' def bootstrap_windows_dev(hga: HGAutomat'
 def build_inno(
     hga: HGAutomation,
     aws_region,
-    python_version,
     arch,
     revision,
     version,
@@ -80,11 +79,9 b' def build_inno('
 
         windows.synchronize_hg(SOURCE_ROOT, revision, instance)
 
-        for py_version in python_version:
             for a in arch:
                 windows.build_inno_installer(
                     instance.winrm_client,
-                    py_version,
                     a,
                     DIST_PATH,
                     version=version,
@@ -94,7 +91,6 b' def build_inno('
 def build_wix(
     hga: HGAutomation,
     aws_region,
-    python_version,
     arch,
     revision,
     version,
@@ -109,11 +105,9 b' def build_wix('
 
         windows.synchronize_hg(SOURCE_ROOT, revision, instance)
 
-        for py_version in python_version:
             for a in arch:
                 windows.build_wix_installer(
                     instance.winrm_client,
-                    py_version,
                     a,
                     DIST_PATH,
                     version=version,
@@ -168,14 +162,13 b' def build_all_windows_packages('
                     dest_path=DIST_PATH,
                 )
 
-        for py_version in (2, 3):
             for arch in ('x86', 'x64'):
                 windows.purge_hg(winrm_client)
                 windows.build_inno_installer(
-                    winrm_client, py_version, arch, DIST_PATH, version=version
+                winrm_client, arch, DIST_PATH, version=version
                 )
                 windows.build_wix_installer(
-                    winrm_client, py_version, arch, DIST_PATH, version=version
+                winrm_client, arch, DIST_PATH, version=version
                 )
 
 
@@ -340,14 +333,6 b' def get_parser():'
         help='Build Inno Setup installer(s)',
     )
     sp.add_argument(
-        '--python-version',
-        help='Which version of Python to target',
-        choices={3},
-        type=int,
-        nargs='*',
-        default=[3],
-    )
-    sp.add_argument(
         '--arch',
         help='Architecture to build for',
         choices={'x86', 'x64'},
@@ -402,14 +387,6 b' def get_parser():'
 
     sp = subparsers.add_parser('build-wix', help='Build WiX installer(s)')
     sp.add_argument(
-        '--python-version',
-        help='Which version of Python to target',
-        choices={3},
-        type=int,
-        nargs='*',
-        default=[3],
-    )
-    sp.add_argument(
         '--arch',
         help='Architecture to build for',
         choices={'x86', 'x64'},

contrib/automation/hgautomation/windows.py

@@ -264,7 +264,6 b' def copy_latest_dist(winrm_client, patte'
 
 def build_inno_installer(
     winrm_client,
-    python_version: int,
     arch: str,
     dest_path: pathlib.Path,
     version=None,
@@ -274,10 +273,7 b' def build_inno_installer('
     Using a WinRM client, remote commands are executed to build
     a Mercurial Inno Setup installer.
     """
-    print(
-        'building Inno Setup installer for Python %d %s'
-        % (python_version, arch)
-    )
+    print('building Inno Setup installer for %s' % arch)
 
     # TODO fix this limitation in packaging code
     if not version:
@@ -319,7 +315,6 b' def build_wheel('
 
 def build_wix_installer(
     winrm_client,
-    python_version: int,
     arch: str,
     dest_path: pathlib.Path,
     version=None,
@@ -328,7 +323,7 b' def build_wix_installer('
 
     Using a WinRM client, remote commands are executed to build a WiX installer.
     """
-    print('Building WiX installer for Python %d %s' % (python_version, arch))
+    print('Building WiX installer for %s' % arch)
 
     # TODO fix this limitation in packaging code
     if not version: