Add missing, not modeled dependency on Yarn 1.22.22. (#938)

Related: pulumi/ci-mgmt#1624 (which I believe
it should be the long term fix)

This is required by the `Makefile` in multiple places and not modeled
anywhere. Example:

```make
install_nodejs_sdk::
	-yarn unlink --cwd $(WORKING_DIR)/sdk/nodejs/bin
	yarn link --cwd $(WORKING_DIR)/sdk/nodejs/bin
```

Author: pose

mise.toml

@@ -0,0 +1,3 @@
+[tools]
+
+yarn = "1.22.22"