[ci] Pin SF until they solve their CI issues.
[ci] Pin SF until they solve their CI issues.

Latest build on SF is erroring due to:

```
  "messages" : [ {
    "type" : "error",
    "message" : "This job has been blocked because no credits are available on your plan. Please upgrade to continue building.",
    "reason" : "execution-authorization-failed"
  } ],
```

we temporary pin to the last successful job that produced artifacts.

coq/coq,gares/coq,silene/coq,JasonGross/coq,SkySkimmer/coq,JasonGross/coq,coq/coq,Zimmi48/coq,ejgallego/coq,coq/coq,gares/coq,Zimmi48/coq,JasonGross/coq,gares/coq,ejgallego/coq,SkySkimmer/coq,SkySkimmer/coq,Zimmi48/coq,silene/coq,gares/coq,coq/coq,silene/coq,JasonGross/coq,ejgallego/coq,gares/coq,ejgallego/coq,Zimmi48/coq,SkySkimmer/coq