chore: update ansible assertion formatting

Signed-off-by: Devin Buhl <devin@buhl.casa>

bootstrap/tasks/validation/age.yaml

@@ -6,7 +6,7 @@
 
 - name: Check if age key file exists
   ansible.builtin.assert:
-    that: [result.stat.exists]
+    that: result.stat.exists
     success_msg: Age file ~/.config/sops/age/keys.txt exists
     fail_msg: Age file ~/.config/sops/age/keys.txt does not exist
 
@@ -16,7 +16,6 @@
 
 - name: Check if age public keys match
   ansible.builtin.assert:
-    that:
-      - "'{{ bootstrap_age_public_key }}' in age_contents"
+    that: bootstrap_age_public_key in age_contents
     success_msg: Age public key {{ bootstrap_age_public_key }} exists
     fail_msg: Age public key {{ bootstrap_age_public_key }} does not exist