Update DV access key regex to be more selective

This should address the code-scanning alert
  https://github.com/gradle/actions/security/code-scanning/1

sources/src/develocity/short-lived-token.ts

@@ -156,7 +156,7 @@ type HostnameAccessKey = {
 }
 
 export class DevelocityAccessCredentials {
-    static readonly accessKeyRegexp = /^(\S+=\w+)(;\S+=\w+)*$/
+    static readonly accessKeyRegexp = /^([^;=\s]+=\w+)(;[^;=\s]+=\w+)*$/
     readonly keys: HostnameAccessKey[]
 
     private constructor(allKeys: HostnameAccessKey[]) {