Fix graphormer model compilation with Cython 3.1.4 (#41671)
Hitting this kind of error when running:
```
cython src/transformers/models/deprecated/graphormer/algos_graphormer.pyx
```
```
Error compiling Cython file:
------------------------------------------------------------
...
(nrows, ncols) = path.shape
assert nrows == ncols
cdef unsigned int n = nrows
cdef unsigned int max_dist_copy = max_dist
path_copy = path.astype(long, order='C', casting='safe', copy=True)
^
------------------------------------------------------------
src/transformers/models/deprecated/graphormer/algos_graphormer.pyx:88:28: undeclared name not builtin: long
```
This appears to have changed between cython==3.0 and cython==3.1. AFAICT the
correct type to use here would be `int`. Switching to it makes the command
succeed and generate an algos_graphormer.c file.