Expanded version range for networkx, fixed sample notebook (#11094)

## Description
Expanded the upper bound for `networkx` dependency to allow installation
of latest stable version. Tested the included sample notebook with
version 3.1, and all steps ran successfully.
---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

docs/extras/use_cases/more/graph/graph_qa.ipynb

@@ -49,7 +49,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "with open(\"../../state_of_the_union.txt\") as f:\n",
+    "with open(\"../../../modules/state_of_the_union.txt\") as f:\n",
     "    all_text = f.read()"
    ]
   },
@@ -296,7 +296,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.1"
+   "version": "3.9.13"
   }
  },
  "nbformat": 4,

libs/langchain/poetry.lock

@@ -10652,4 +10652,4 @@ text-helpers = ["chardet"]
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8.1,<4.0"
-content-hash = "d8521717f7e2210f516af806f8c2655815411f6df776d8812b80fda871a73651"
+content-hash = "ce46d0939d26903ed3de2f4d297d7aa6b359d1a466df80861e9898d865bfc8c9"

libs/langchain/pyproject.toml

@@ -55,7 +55,7 @@ sentence-transformers = {version = "^2", optional = true}
 aiohttp = "^3.8.3"
 arxiv = {version = "^1.4", optional = true}
 pypdf = {version = "^3.4.0", optional = true}
-networkx = {version="^2.6.3", optional = true}
+networkx = {version=">=2.6.3, <4", optional = true}
 aleph-alpha-client = {version="^2.15.0", optional = true}
 deeplake = {version = "^3.6.8", optional = true}
 libdeeplake = {version = "^0.0.60", optional = true}