8: pin dellemc.enterprise_sonic to 2.0.0 (#234)

dellemc.enterprise_sonic has depclosure errors. This pins it to the last
working version. We wouldn't normally use ==, but in this case, 2.0.0 is
the only release in the range.

```
ERROR: found collection dependency
ERROR: dellemc.enterprise_sonic version_conflict: ansible.netcommon-5.1.1 but needs >=2.0.0,<5.0.0
```

Relates: #233
Relates: ansible-collections/dellemc.enterprise_sonic#267

8/ansible-8.build

@@ -57,7 +57,9 @@ community.zabbix: >=2.0.0,<3.0.0
 containers.podman: >=1.10.0,<2.0.0
 cyberark.conjur: >=1.2.0,<2.0.0
 cyberark.pas: >=1.0.0,<2.0.0
-dellemc.enterprise_sonic: >=2.0.0,<3.0.0
+# 2.1.0 has depclosure errors
+# https://github.com/ansible-community/ansible-build-data/issues/233
+dellemc.enterprise_sonic: ==2.0.0
 dellemc.openmanage: >=7.5.0,<8.0.0
 dellemc.powerflex: >=1.6.0,<2.0.0
 dellemc.unity: >=1.6.0,<2.0.0