chore(deps): update dependency rstcheck to v6.3.0 (#882)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pyproject.toml

@@ -23,7 +23,7 @@ docs = [
     "breathe==4.36.0",
     "furo==2025.12.19",
     "myst-parser==5.1.0",
-    "rstcheck[sphinx]==6.2.5",
+    "rstcheck[sphinx]==6.3.0",
     "rstfmt==0.0.14",
     "Sphinx==9.1.0",
     "sphinx-copybutton==0.5.2",