Remove deprecation warning messages

[c-bata]

Contributor License Agreement

This repository (optuna-dashboard) and Goptuna share common code.
This pull request may therefore be ported to Goptuna.
Make sure that you understand the consequences concerning licenses and check the box below if you accept the term before creating this pull request.

• I agree this patch may be ported to Goptuna by other Goptuna contributors.

Reference Issues/PRs

None

What does this implement/fix? Explain your changes.

Before

$ optuna-dashboard sqlite:///db.sqlite3 --host 0.0.0.0
[2024-01-24 09:53:13 +0900] [3088821] [INFO] Starting gunicorn 21.2.0
[2024-01-24 09:53:13 +0900] [3088821] [INFO] Listening at: http://0.0.0.0:8080 (3088821)
[2024-01-24 09:53:13 +0900] [3088821] [INFO] Using worker: gthread
[2024-01-24 09:53:13 +0900] [3088853] [INFO] Booting worker with pid: 3088853
/home/cbata/go/src/github.com/optuna/optuna-dashboard/venv/lib/python3.11/site-packages/optuna/study/_study_summary.py:115: FutureWarning: `system_attrs` has been deprecated in v3.1.0. The removal of this feature is currently scheduled for v5.0.0, but this schedule is subject to change. See https://github.com/optuna/optuna/releases/tag/v3.1.0.
  warnings.warn(
/home/cbata/go/src/github.com/optuna/optuna-dashboard/venv/lib/python3.11/site-packages/optuna/study/_study_summary.py:115: FutureWarning: `system_attrs` has been deprecated in v3.1.0. The removal of this feature is currently scheduled for v5.0.0, but this schedule is subject to change. See https://github.com/optuna/optuna/releases/tag/v3.1.0.
  warnings.warn(
/home/cbata/go/src/github.com/optuna/optuna-dashboard/venv/lib/python3.11/site-packages/optuna/study/_study_summary.py:115: FutureWarning: `system_attrs` has been deprecated in v3.1.0. The removal of this feature is currently scheduled for v5.0.0, but this schedule is subject to change. See https://github.com/optuna/optuna/releases/tag/v3.1.0.
  warnings.warn(

After

$ optuna-dashboard sqlite:///db.sqlite3 --host 0.0.0.0
[2024-01-24 10:06:20 +0900] [3096288] [INFO] Starting gunicorn 21.2.0
[2024-01-24 10:06:20 +0900] [3096288] [INFO] Listening at: http://0.0.0.0:8080 (3096288)
[2024-01-24 10:06:20 +0900] [3096288] [INFO] Using worker: gthread
[2024-01-24 10:06:20 +0900] [3096320] [INFO] Booting worker with pid: 3096320
[2024-01-24 10:06:52 +0900] [3096288] [INFO] Handling signal: winch

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (ac1e1b6) 69.48% compared to head (06a0d5d) 69.50%.
Report is 36 commits behind head on main.

Files	Patch %	Lines
optuna_dashboard/artifact/_backend.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #769      +/-   ##
==========================================
+ Coverage   69.48%   69.50%   +0.02%     
==========================================
  Files          35       35              
  Lines        2353     2358       +5     
==========================================
+ Hits         1635     1639       +4     
- Misses        718      719       +1     

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