Bump version: 2.13.2

[lildude]

Includes general improvements, bug fixes and support for GitHub Enterprise v2.13.2

• Treat missing repository networks, gists, and storage objects as a non-critical error Treat missing repository networks, gists, and storage objects as a non-critical error  #386
• Clean up stale HA nodes on restore Clean up stale HA nodes on restore #396
• Cleanup all SSH muxes in a non blocking way Cleanup all SSH muxes in a non blocking way #402
• Raise an error if the current symlink doesn't exist when attempting to restore it Raise an error if the current symlink doesn't exist when attempting to restore it #404

/cc @github/backup-utils