[skip ci] Update nightly support matrices

Signed-off-by: Buildkite Bot <buildkite-bot@users.noreply.github.com>

Author: buildkite-bot

support_matrices/nightly/text_only_model_support_matrix.csv

@@ -4,5 +4,5 @@ Model,UnitTest,IntegrationTest,Benchmark
 "google/gemma-3-27b-it",✅,✅,❌
 "Qwen/Qwen3-32B",✅,✅,✅
 "meta-llama/Llama-Guard-4-12B",N/A,N/A,N/A
-"meta-llama/Llama-3.1-8B-Instruct",✅,✅,❌
+"meta-llama/Llama-3.1-8B-Instruct",✅,✅,✅
 "Qwen/Qwen3-30B-A3B",✅,✅,❌