Update lockfile rebuild workflow

2023-03-28

* Drop poetry versions prior to 1.2.2
  - Version 1.3.0 introduced a newer "format" of lockfile.
  - Upstream LiSP has updated the lockfile to this newer format.
  - Versions earlier than 1.2.2 this cannot understand this new format so
    cannot read it to update it.
  - 1.2.2 can read it, but still writes the old format. This is being kept in
    workflow as a "way back".

.github/workflows/lockfile.yml

@@ -39,8 +39,6 @@ jobs:
         - 1.3.1
         - 1.3.0
         - 1.2.2
-        - 1.2.1
-        - 1.2.0
 
     steps: