bump libidn2 dependency in GnuTLS 3.7.8 to v2.3.7

[boegel]

required to fix failing CI:

Found 2 variants of 'libidn2' dependency in easyconfigs using 'GCCcore-12.3' toolchain generation
* version: 2.3.2; versionsuffix:  as dep for {'GnuTLS-3.7.8-GCCcore-12.3.0.eb'}
  * version: 2.3.7; versionsuffix:  as dep for {'wget-1.24.5-GCCcore-12.3.0.eb'}

Got introduced by merging:

• {bio}[foss/2023a] HOMER v4.11 w/ R 4.3.2, libidn2 v2.3.7, wget v1.24.5 #20590
• [foss/2023a] dependencies for RoseTTAFold-All-Atom #20616

[boegel]

@boegelbot please test @ generoso

[boegel]

duplicate of #20771

[boegelbot]

@boegel: Request for testing this PR well received on login1

PR test command 'EB_PR=20772 EB_ARGS= EB_CONTAINER= EB_REPO=easybuild-easyconfigs /opt/software/slurm/bin/sbatch --job-name test_PR_20772 --ntasks=4 ~/boegelbot/eb_from_pr_upload_generoso.sh' executed!

• exit code: 0
• output:

Submitted batch job 13666

Test results coming soon (I hope)...

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