Switch sphinx theme to immaterial

[kumiDa]

Following package version bumps have been done in requirements.in and corresponding auto updates are done in requirements.txt

Package	old_version	new_version
sphinx	7.3.7	8.2.3
myst_parser	2.0.0	4.0.1
markupsafe	2.1.5	3.0.2

[wendigo]

@kumiDa can you add sphinx-immaterial so we can use the new image with trinodb/trino#25735

[ebyhr]

The commit title is too long. Please follow https://trino.io/development/process#pull-request-and-commit-guidelines-

[kumiDa]

The commit title is too long. Please follow https://trino.io/development/process#pull-request-and-commit-guidelines-

@ebyhr, thanks for you review. This is addressed in 4cf888f, please review.

@kumiDa can you add sphinx-immaterial so we can use the new image with trinodb/trino#25735

@wendigo, i have incorporated the suggested changes in 4cf888f, please review.

[wendigo]

@kumiDa I've amended commit message to reflect actual intent