build: bump ansys-sphinx-theme from 1.2.4 to 1.2.6 in the doc group (#597)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -52,7 +52,7 @@ tests = [
     "numpy==2.2.1"
 ]
 doc = [
-    "ansys-sphinx-theme==1.2.4",
+    "ansys-sphinx-theme==1.2.6",
     "build==1.2.2.post1",
     "jupyterlab==4.3.4",
     "jupytext==1.16.6",