Test fails with Perl 5.38

From https://bugs.debian.org/1043239 :

Source: lemonldap-ng Version: 2.16.1+ds-2 Severity: important Tags: ftbfs trixie sid User: debian-perl@lists.debian.org Usertags: perl-5.38-transition

This package fails to build from source with Perl 5.38 (currently in experimental.)

http://perl.debian.net/rebuild-logs/perl-5.38-throwaway/lemonldap-ng_2.16.1+ds-2/lemonldap-ng_2.16.1+ds-2_amd64-2023-08-04T06:12:12Z.build

#   Failed test 'Found correct error message'
#   at t/12-Lemonldap-NG-Handler-Jail.t line 114.
#                   'syntax error at (eval 52) line 1, at EOF
# Execution of (eval 52) aborted due to compilation errors.
# '
#     doesn't match '(?^:Missing right curly or square bracket)'
# Looks like you failed 1 test of 22.

#   Failed test 'Found correct error message'
#   at t/13-Lemonldap-NG-Handler-Fake-Safe.t line 107.
#                   'syntax error at (eval 47) line 1, at EOF
# Execution of (eval 47) aborted due to compilation errors.
# '
#     doesn't match '(?^:Missing right curly or square bracket)'
# Looks like you failed 1 test of 16.

Test Summary Report
-------------------
t/12-Lemonldap-NG-Handler-Jail.t                         (Wstat: 256 (exited 1) Tests: 22 Failed: 1)
  Failed test:  22
  Non-zero exit status: 1
t/13-Lemonldap-NG-Handler-Fake-Safe.t                    (Wstat: 256 (exited 1) Tests: 16 Failed: 1)
  Failed test:  16
  Non-zero exit status: 1
Files=25, Tests=405,  7 wallclock secs ( 0.08 usr  0.03 sys +  4.03 cusr  0.70 csys =  4.84 CPU)
Result: FAIL

This looks like just an issue of changed diagnostics, but please don't hesitate to file a bug against perl in case it turns out to have runtime effects that warrant a Breaks entry.