Fix: Replace non-tuple indexing to resolve PyTorch deprecation warning

[drivanov]

PR fixes the following warnings:

test/data/test_large_graph_indexer.py::test_large_graph_index
  /usr/local/lib/python3.12/dist-packages/torch_geometric/data/large_graph_indexer.py:300: UserWarning: Using a non-tuple 
sequence for multidimensional indexing is deprecated and will be changed in pytorch 2.9; use x[tuple(seq)] instead of 
x[seq]. In pytorch 2.9 this will be interpreted as tensor index, x[torch.tensor(seq)], which will result either in 
an error or a different result (Triggered internally at /opt/pytorch/pytorch/torch/csrc/autograd/python_variable_indexing.cpp:296.)
    return values[idxs]

test/data/test_large_graph_indexer.py::test_large_graph_index
  /usr/local/lib/python3.12/dist-packages/torch_geometric/data/large_graph_indexer.py:424: UserWarning: Using a non-tuple 
sequence for multidimensional indexing is deprecated and will be changed in pytorch 2.9; use x[tuple(seq)] instead of 
x[seq]. In pytorch 2.9 this will be interpreted as tensor index, x[torch.tensor(seq)], which will result either in 
an error or a different result (Triggered internally at /opt/pytorch/pytorch/torch/csrc/autograd/python_variable_indexing.cpp:296.)
    return values[idxs]

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.83%. Comparing base (c211214) to head (9b96fc9).
⚠️ Report is 81 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #10389      +/-   ##
==========================================
- Coverage   86.11%   85.83%   -0.28%     
==========================================
  Files         496      501       +5     
  Lines       33655    34454     +799     
==========================================
+ Hits        28981    29574     +593     
- Misses       4674     4880     +206     

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[puririshi98]

lgtm