chore(langchain): make langchain version skip conditional less precis…

…e for CI (#9997)

Even after #9768 we're still seeing some tests be skipped on CI,
specifically `langchain-community` tests even when `langchain>=0.1`. My
suspicion is that the `sys.version_info < (0, 1, 0)` conditional that is
used for the test skipping is too precise for the versions of Langchain
being run on CI (not exactly sure what the issue is, but I've narrowed
it down to that area). This PR only checks the major and minor version
of Langchain being run

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- Title is accurate
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[API](https://ddtrace.readthedocs.io/en/stable/versioning.html#interfaces)
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tests/contrib/langchain/test_langchain_community.py

@@ -16,7 +16,7 @@
 
 LANGCHAIN_VERSION = parse_version(langchain.__version__)
 
-pytestmark = pytest.mark.skipif(LANGCHAIN_VERSION < (0, 1, 0), reason="This module only tests langchain >= 0.1")
+pytestmark = pytest.mark.skipif(LANGCHAIN_VERSION < (0, 1), reason="This module only tests langchain >= 0.1")
 
 IGNORE_FIELDS = [
     "resources",