Update compatibility.md

[mc-nv]

Why

TRI-1059 — Update docs/introduction/compatibility.md to add the 26.05 row before NGC release.

What

Add 26.05 rows to all three compatibility tables in docs/introduction/compatibility.md:

• trtllm-python-py3: Python 3.12.3, Torch 2.10.0a0+b4e4ee81d3.nv25.12, TensorRT 10.14.1.48, TensorRT-LLM 1.2.1, CUDA 13.1.0.036, Driver 590.44.01, Size 14.22 GB
• vllm-python-py3: Python 3.12.3, vLLM 0.19.0+6bc3197f.nv26.04.48761268, CUDA 13.2.1.009, Driver 595.58.03, Size 9.3G
• ONNX Runtime: 1.24.4 (per build.py build map for the 26.05 release)

The 26.05 release is built on the 26.04 upstream container (upstream_container_version: "26.04" in build.py), so the trtllm-python-py3 base toolchain matches 26.04. Only the vLLM container size differs (9.3G vs 9.09G).

Test plan

• Visual verification of table formatting matches existing rows
• ORT version cross-checked against build.py build map on r26.05