Fix Netlify build timeouts (astronomer#1294)

Netlify jobs are failing during the "Initialization" step as seen in:
https://app.netlify.com/sites/sunny-pastelito-5ecb04/deploys/67225eeb6eaeb400080afce5

With the error:
```
5:01:30 PM: Failed during stage 'Install dependencies': Command did not finish within the time limit
5:01:30 PM: Execution timed out after 17m59.815960796s
5:01:30 PM: Execution timed out after 17m59.917466353s
5:01:30 PM: Failing build: Failed to install dependencies
```

Dependency resolution is a pain. After confirming the dependencies that
were taking longer, I pinned several of them, based on the constraints
file:
https://github.com/apache/airflow/blob/constraints-2.10.0/constraints-3.10.txt

This seems to have reduced the installation of the docs dependencies
significantly:

Locally:
```
time pip install -r requirements.txt
42.67s
```

In Netlify, the Initialization step was reduced to less than 3 min:

https://app.netlify.com/sites/sunny-pastelito-5ecb04/deploys/672364e906837e00087c53ac

docs/requirements.txt

@@ -1,13 +1,16 @@
 aenum
-apache-airflow
-apache-airflow-providers-amazon[s3fs]>=3.0.0
-apache-airflow-providers-cncf-kubernetes>=5.1.1
-apache-airflow-providers-google
-apache-airflow-providers-microsoft-azure
-google-re2==1.1
+apache-airflow==2.10.0
+PyAthena==3.9.0
+redshift-connector==2.1.3
+fsspec==2024.6.1
+boto3==1.34.131
+aiobotocore==2.13.2
+apache-airflow-providers-amazon[s3fs]==8.27.0
+apache-airflow-providers-cncf-kubernetes==8.3.4
+apache-airflow-providers-google==10.21.1
+apache-airflow-providers-microsoft-azure==10.3.0
+apache-airflow-providers-openlineage==1.10.0
 msgpack
-openlineage-airflow
-pydantic
 pydata-sphinx-theme
 sphinx
 sphinx-autoapi

netlify.toml

@@ -12,7 +12,7 @@
 
   # Default build command.
   command = "make dirhtml"
-  environment = { PYTHON_VERSION = "3.8" }
+  environment = { PYTHON_VERSION = "3.10" }
 
 # Production context: all deploys from the Production branch
 # set in your site’s Branches settings in the UI will inherit