Support tox tests on ansible 12 alphas

tox.ini

@@ -47,6 +47,7 @@
 # ansible == 9.x     ansible-core ~= 2.16.0
 # ansible == 10.x    ansible-core ~= 2.17.0
 # ansible == 11.x    ansible-core ~= 2.18.0
+# ansible == 12.x    ansible-core ~= 2.19.0
 
 # See also
 # - https://docs.ansible.com/ansible/latest/reference_appendices/release_and_maintenance.html#ansible-core-support-matrix
@@ -56,7 +57,7 @@ envlist =
     init,
     py{27,36}-mode_ansible-ansible{2.10,3,4},
     py{311}-mode_ansible-ansible{2.10,3,4,5},
-    py{313}-mode_ansible-ansible{6,7,8,9,10,11},
+    py{313}-mode_ansible-ansible{6,7,8,9,10,11,12},
     py{27,36,313}-mode_mitogen,
     report,
 
@@ -85,7 +86,8 @@ deps =
     ansible8: ansible~=8.0
     ansible9: ansible~=9.0
     ansible10: ansible~=10.0
-    ansible11: ansible>=11.0
+    ansible11: ansible~=11.0
+    ansible12: ansible>=12.0a
 install_command =
     python -m pip --no-python-version-warning --disable-pip-version-check install {opts} {packages}
 commands_pre =
@@ -118,6 +120,7 @@ setenv =
     ansible10: MITOGEN_TEST_DISTRO_SPECS=debian10-py3 debian11-py3 ubuntu2004-py3
     # Ansible 11 (ansible-core 2.18) requires Python >= 3.8 on targets
     ansible11: MITOGEN_TEST_DISTRO_SPECS=debian11-py3 ubuntu2004-py3
+    ansible12: MITOGEN_TEST_DISTRO_SPECS=debian11-py3 ubuntu2004-py3
     distros_centos: MITOGEN_TEST_DISTRO_SPECS=centos6 centos7 centos8
     distros_centos5: MITOGEN_TEST_DISTRO_SPECS=centos5
     distros_centos6: MITOGEN_TEST_DISTRO_SPECS=centos6