feat: declare community.general collection requirement

The role uses the community.general.sudoers module, but did not declare the
collection dependency like the sibling roles unix-users and
certificate_authority do. The sudoers module was added in community.general
4.3.0, its runas parameter in 4.7.0, therefore 4.7.0 is the lowest usable
version.

Co-authored-by: Copilot <copilot@github.com>

requirements.yml

@@ -0,0 +1,7 @@
+---
+
+collections:
+# The sudoers module has been added in community.general 4.3.0, its runas
+# parameter in 4.7.0.
+- name: community.general
+  version: ">=4.7.0"