Bump base-worker cache version to 3
Closes #185 (closed)
With Yoann's help, I broke the backend (backend#1651 (closed)).
Then I broke the frontend (frontend#1327 (closed), frontend#1328 (closed)).
Then I broke UFCN (dla/doc-ufcn#28 (closed)).
And then I broke base-worker (workers/base-worker#247 (closed)).
But tasks did not break, and I did test this MR successfully in the end