Add the Installation assistant version bump

[teddytpc1]

Description

Due to the changes made here: #3092, we need to add the installation assistant version bump in the bump_version.py script.
The script should change:

• the source_branch in the unattended_installer/install_functions/installVariables.sh file:
  

  wazuh-packages/unattended_installer/install_functions/installVariables.sh

  Line 14 in 5f5d9f5

  readonly source_branch="v${wazuh_version}"

• the source_branch in the unattended_installer/builder.sh file:
  

  wazuh-packages/unattended_installer/builder.sh

  Line 19 in 5f5d9f5

  source_branch="5.0.0"

The final value should be vX.Y.Z-stage, e.g.: v4.9.1-rc1 for both variables.

The tag should contain this change and should be reverted in the release branch.

Related:

• Change version to tag reference in source_branch references #3098