chore: set base version to 0.20 (#10382)

tools/@types/build-config/package.json

@@ -3,5 +3,5 @@
   "private": true,
   "types": "./__all.d.ts",
   "type": "module",
-  "version": "0.19.0"
+  "version": "0.20.0"
 }

tools/@types/env/package.json

@@ -7,5 +7,5 @@
     "@affine/env": "workspace:*",
     "@blocksuite/affine": "workspace:*"
   },
-  "version": "0.19.0"
+  "version": "0.20.0"
 }