Handbook: update startedOn date of auto-issue rituals. (#17835)

Changes:
- updated the `startedOn` date of 3 rituals with auto-issue enabled.

handbook/business-operations/business-operations.rituals.yml

@@ -44,7 +44,7 @@
     repo: "confidential"
 -
   task: "AP invoice monitoring" # TODO tie this to a responsibility
-  startedOn: "2024-03-31" 
+  startedOn: "2024-04-01" 
   frequency: "Weekly"
   description: "Look for new accounts payable invoices and make sure that Fleet's suppliers are paid" 
   moreInfoUrl: 
@@ -64,7 +64,7 @@
     repo: "confidential"
 -
   task: "Vanta check" # TODO tie this to a responsibility
-  startedOn: "2024-03-01" 
+  startedOn: "2024-04-01" 
   frequency: "Monthly"
   description: "Look for any new actions in Vanta due in the upcoming months and create issues to ensure they're done on time" 
   moreInfoUrl: 

handbook/digital-experience/digital-experience.rituals.yml

@@ -3,7 +3,7 @@
 
 - 
   task: "Check browser compatibility for fleetdm.com"
-  startedOn: "2024-03-01" 
+  startedOn: "2024-03-06" 
   frequency: "Monthly"
   description: "Run `npm audit --only=prod` to check for vulnerabilities on the production dependencies of fleetdm.com."
   moreInfoUrl: "https://fleetdm.com/handbook/digital-experience#check-production-dependencies-of-fleetdm-com"