tpa-rfc-43: fix years in timeline

policy/tpa-rfc-43-cymru-migration-plan.md

@@ -475,13 +475,13 @@ Some basic constraints:
 
 Tentative timeline:
 
- * November 2023
+ * November 2022
    * W47: adopt this proposal
    * W47: order servers
    * W47: confirm colo contract
    * W47: [New colocation facility access][]
    * W48-W49: [chi-node-14 transfer][] (outage)
- * December 2023
+ * December 2022
    * waiting for servers
    * W52: end of hardware support from Cymru
    * W52: holidays