Increase sglang retries on CI (tensorzero#2953)

This should help to ensure a pass on the tool-call tests when
running without the provider-proxy cache

Author: Aaron1011

.config/nextest.toml

@@ -81,6 +81,8 @@ slow-timeout = { period = "60s", terminate-after = 2 }
 
 [[profile.default.overrides]]
 filter = 'binary(e2e) and test(providers::sglang::)'
+# The model we run on SGLang often fails to emit valid tool calls, so we need many retries
+retries = { backoff = "fixed", count = 8, delay = "10s", jitter = true }
 slow-timeout = { period = "60s", terminate-after = 2 }
 
 [[profile.default.overrides]]