[cpackget] Unable to download a pack file that contains the build identifier

[Torbjorn-Svensson]

Describe the bug

Imagine a pack index file that contains a pack and the pack file contains the build identifier. Example:

<pdsc url="https://www.keil.com/pack/" vendor="ARM" name="CMSIS" version="6.1.0+foo" />

Then we try to install it using cpackget:

cpackget add --verbose ARM::[email protected]+foo

The command would generate output that ends with:

D: bad status: 404
E: "https://www.keil.com/pack/ARM.CMSIS.6.1.0.pack": bad request

But it should try to download https://www.keil.com/pack/ARM.CMSIS.6.1.0+foo.pack instead.
In the .pdsc file embedded in the .pack file, the the release node is:

  <releases>
    <release date="2024-02-30" version="6.1.0+foo">
      the change log entries...
   </release>
  </releases>

To Reproduce
See above.

Expected behavior
The pack file should be downloaded.

Environment (please complete the following information):

• OS: any
• Version 2.1.4?

Additional context
Obviously, we did not see the problem with the ARM.CMSIS.6.1.0 pack, but an internal pack. The steps above should highlight the question regardless of the pack name.
The .pack files is named including the metadata/build identifier on the server.