chore: Update black dep to v26 (#188)

Author: dishaprakash

pyproject.toml

@@ -38,7 +38,7 @@ Changelog = "https://github.com/googleapis/llama-index-cloud-sql-pg-python/blob/
 
 [project.optional-dependencies]
 test = [
-    "black[jupyter]==25.12.0",
+    "black[jupyter]==26.1.0",
     "isort==7.0.0",
     "mypy==1.19.1",
     "pytest-asyncio==1.3.0",

samples/llama_index_doc_store.ipynb

@@ -396,7 +396,6 @@
    "source": [
     "from llama_index_cloud_sql_pg import PostgresIndexStore\n",
     "\n",
-    "\n",
     "INDEX_TABLE_NAME = \"index_store\"\n",
     "await engine.ainit_index_store_table(\n",
     "    table_name=INDEX_TABLE_NAME,\n",

samples/llama_index_quick_start.ipynb

@@ -486,13 +486,11 @@
     "netflix_data = \"netflix_titles.csv\"\n",
     "\n",
     "df = pd.read_csv(netflix_data)\n",
-    "insert_data_cmd = sqlalchemy.text(\n",
-    "    \"\"\"\n",
+    "insert_data_cmd = sqlalchemy.text(\"\"\"\n",
     "    INSERT INTO netflix_titles VALUES (:show_id, :type, :title, :director,\n",
     "      :cast, :country, :date_added, :release_year, :rating,\n",
     "      :duration, :listed_in, :description)\n",
-    "    \"\"\"\n",
-    ")\n",
+    "    \"\"\")\n",
     "\n",
     "parameter_map = [\n",
     "    {\n",
@@ -615,7 +613,6 @@
    "source": [
     "from llama_index_cloud_sql_pg import PostgresReader\n",
     "\n",
-    "\n",
     "table_name = \"netflix_titles\"\n",
     "content_columns = [\"title\", \"director\", \"cast\", \"description\"]\n",
     "metadata_columns = [\n",