scrcpy 2.1.1 release source code install script is not completely up to date - still requesting server-2.1 and consequently fails

**Environment**
- OS: Debian 12 (but irrelevant)
- scrcpy version: 2.1.1
- installation method:source code / installation script
- device model: N/A
- Android version: N/A

**Describe the bug**
The latest released 2.1.1 installed via the downloaded source code is installing the 2.1 server and not the 2.1.1 due to the install_release.sh file being slightly out of date.
Manually replacing the downloaded install_release.sh with the live version from the master branch worked perfectly.

Compare the install_release.sh file in the 2.1.1 downloaded source with the live version on the master branch, focusing on the server version requested by the script. Run the source installation script after the update and verify that it installs the 2.1.1 server rather than server-2.1.

Written by the indexing model from the issue text.