fix(autoupdate): remove any whitespace from hash (#3579)

Allow extracting hashes with containing spaces and newlines
(e.g. `ef 5d 41 08 32 9c 71 b4 b5 b6 0f be 2f bc 49 ac ef 86 69 49 42 e8 37 65 a4 86 30
 10 ea be 0d 79`)

FreeCad Example:
```json
"hash": {
    "url": "$url-SHA256.txt",
    "regex": "(?sm):\\s+([a-f\\d\\s]+)CertUtil"
}
```

lib/autoupdate.ps1

@@ -58,7 +58,7 @@ function find_hash_in_textfile([String] $url, [Hashtable] $substitutions, [Strin
     $regex = substitute $regex $substitutions $true
     debug $regex
     if ($hashfile -match $regex) {
-        $hash = $matches[1] -replace ' ',''
+        $hash = $matches[1] -replace '\s',''
     }
 
     # convert base64 encoded hash values