deps: use optional dependency rfc3987-syntax2 instead of rfc3987-syntax

[jkowalleck]

in #1388 a non-gpl library for validating IRI was introduced.

Unfortunately, the library rfc3987-syntax (https://pypi.org/project/rfc3987-syntax/) is no longer maintained.
Therefore, a maintained fork rfc3987-syntax2 (https://pypi.org/project/rfc3987-syntax2/) exists, which is used here.

rfc3987-syntax2 v1.3.0 has various improvements over the old rfc3987-syntax v1.1.0

• lazy-loading - improving import times tremendously

  • simple bench

    $ # new lib
    $ time python -c "from rfc3987_syntax2 import is_valid_syntax as _rfc3987_is_valid_syntax"
    
    ________________________________________________________
    Executed in  149.03 millis    fish           external
       usr time  133.83 millis    0.00 micros  133.83 millis
       sys time   13.60 millis  708.00 micros   12.89 millis
    
    $ # old lib 
    $ time python -c "from rfc3987_syntax import is_valid_syntax as _rfc3987_is_valid_syntax"
    
    ________________________________________________________
    Executed in    2.20 secs    fish           external
       usr time    2.16 secs  782.00 micros    2.16 secs
       sys time    0.03 secs  115.00 micros    0.03 secs

  • test compare in CI pipeline
    • new lib on PR: 10.006s - https://github.com/python-jsonschema/jsonschema/actions/runs/29859393697/job/88731960392?pr=1521#step:8:8839
    • old lib on main: 27.485s - https://github.com/python-jsonschema/jsonschema/actions/runs/29805998926/job/88556570183#step:8:8839

• is RFC 3987 syntax complete (old lib had blind-spots)

• various bug fixes

  • https://github.com/jkowalleck/rfc3987-syntax2/releases#release-v1.3.0
  • https://github.com/jkowalleck/rfc3987-syntax2/releases#release-v1.2.0
  • https://github.com/jkowalleck/rfc3987-syntax2/releases#release-v1.1.1

• proper typing and API docs

[read-the-docs-community]

Documentation build overview

📚 python-jsonschema | 🛠️ Build #33694151 | 📁 Comparing 271cf7a against latest (0274292)

  🔍 Preview build  

2 files changed

± validate/index.html
± _modules/jsonschema/_format/index.html

[jkowalleck]

@Julian I think we should switch to this library

[jkowalleck]

@kdeldycke could you check whether this also requires your downstream mod like in Nuitka/Nuitka#3578