svn2git crashes due to API change in ruby 3.2

[Coenraad Stijne]

svn2git will crash with the following error message:

/usr/lib/ruby/vendor_ruby/svn2git/migration.rb:58:in `parse': undefined method `exists?' for File:Class (NoMethodError)

Due to API change, `exists` -> `exist`

svn2git:
  Installed: 2.4.0-3
  Candidate: 2.4.0-3
  Version table:
 *** 2.4.0-3 500
        500 http://archive.ubuntu.com/ubuntu noble/universe amd64 Packages
        100 /var/lib/dpkg/status

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=24.04
DISTRIB_CODENAME=noble
DISTRIB_DESCRIPTION="Ubuntu 24.04 LTS"
PRETTY_NAME="Ubuntu 24.04 LTS"
NAME="Ubuntu"
VERSION_ID="24.04"
VERSION="24.04 LTS (Noble Numbat)"
VERSION_CODENAME=noble
ID=ubuntu
ID_LIKE=debian
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
UBUNTU_CODENAME=noble
LOGO=ubuntu-logo