ci: add coverage and ruff (#1383)

* add coverage calculation and push

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* new codecov version and usage of token

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* enable ruff formatter instead of black and isort

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* apply ruff lint fixes

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* apply ruff unsafe fixes

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* add removed imports

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* runs 1 on linter issues

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* finalize linter fixes

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

* Update pyproject.toml

Co-authored-by: Cesar Berrospi Ramis <75900930+ceberam@users.noreply.github.com>
Signed-off-by: Michele Dolfi <97102151+dolfim-ibm@users.noreply.github.com>

---------

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>
Signed-off-by: Michele Dolfi <97102151+dolfim-ibm@users.noreply.github.com>
Co-authored-by: Cesar Berrospi Ramis <75900930+ceberam@users.noreply.github.com>

docling/backend/docx/latex/latex_dict.py

@@ -1,12 +1,8 @@
-# -*- coding: utf-8 -*-
-
 """
 Adapted from https://github.com/xiilei/dwml/blob/master/dwml/latex_dict.py
 On 23/01/2025
 """
 
-from __future__ import unicode_literals
-
 CHARS = ("{", "}", "_", "^", "#", "&", "$", "%", "~")
 
 BLANK = ""
@@ -79,7 +75,6 @@ CHR_BO = {
 }
 
 T = {
-    "\u2192": "\\rightarrow ",
     # Greek letters
     "\U0001d6fc": "\\alpha ",
     "\U0001d6fd": "\\beta ",