test(node-integration-tests): Unpin langchain

[andreiborza]

What

Restores langchain: ^1.0.0 in the initChatModel test block, reverting the pin from #23391.

Why

The pin works around langchain@1.5.7 importing DEFAULT_LANGSMITH_GATEWAY from @langchain/core, which no published core version exports. Do not merge until upstream ships a fix (a langchain release without the broken import, or a @langchain/core release that exports it); CI on this PR stays red until then and doubles as the canary.

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	28.57 kB	-	-
@sentry/browser - with treeshaking flags	26.92 kB	-	-
@sentry/browser - with treeshaking flags tracing without tracing	26.82 kB	-	-
@sentry/browser (incl. Tracing)	48.34 kB	-	-
@sentry/browser (incl. Tracing + Span Streaming)	48.36 kB	-	-
@sentry/browser (incl. Tracing, Profiling)	51.25 kB	-	-
@sentry/browser (incl. Tracing, Replay)	87.74 kB	-	-
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	77.2 kB	-	-
@sentry/browser (incl. Tracing, Replay with Canvas)	92.45 kB	-	-
@sentry/browser (incl. Tracing, Replay, Feedback)	105.13 kB	-	-
@sentry/browser (incl. Feedback)	45.81 kB	-	-
@sentry/browser (incl. sendFeedback)	33.36 kB	-	-
@sentry/browser (incl. FeedbackAsync)	38.47 kB	-	-
@sentry/browser (incl. Metrics)	29.52 kB	-	-
@sentry/browser (incl. Logs)	29.8 kB	-	-
@sentry/browser (incl. Metrics & Logs)	30.45 kB	-	-
@sentry/react	30.33 kB	-	-
@sentry/react (incl. Tracing)	50.52 kB	-	-
@sentry/vue	35.4 kB	-	-
@sentry/vue (incl. Tracing)	50.32 kB	-	-
@sentry/svelte	28.6 kB	-	-
CDN Bundle	30.32 kB	-	-
CDN Bundle (incl. Tracing)	48.87 kB	-	-
CDN Bundle (incl. Logs, Metrics)	32.54 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics)	50.74 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics)	72.91 kB	-	-
CDN Bundle (incl. Tracing, Replay)	86.33 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	88.16 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback)	92.07 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	94 kB	-	-
CDN Bundle - uncompressed	89.94 kB	-	-
CDN Bundle (incl. Tracing) - uncompressed	146.13 kB	-	-
CDN Bundle (incl. Logs, Metrics) - uncompressed	96.23 kB	-	-
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	151.81 kB	-	-
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	225.18 kB	-	-
CDN Bundle (incl. Tracing, Replay) - uncompressed	265.4 kB	-	-
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	271.07 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	279.09 kB	-	-
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	284.76 kB	-	-
@sentry/nextjs (client)	53.06 kB	-	-
@sentry/sveltekit (client)	48.76 kB	-	-
@sentry/core/server	64.95 kB	-	-
@sentry/core/browser	52.11 kB	-	-
@sentry/node	117.49 kB	+0.03%	+24 B 🔺
@sentry/node/import (ESM hook with diagnostics-channel injection)	85.18 kB	-	-
@sentry/node - without tracing	82.03 kB	+0.04%	+25 B 🔺
@sentry/aws-serverless	91.46 kB	+0.03%	+22 B 🔺
@sentry/cloudflare (withSentry) - minified	194.68 kB	-	-
@sentry/cloudflare (withSentry)	481.3 kB	-	-

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