google.api_core.exceptions.RetryError: Timeout of 60.0s exceeded, last exception: 503 DNS resolution failed for firestore.googleapis.com: C-ares status is not ARES_SUCCESS qtype=A name=firestore.googleapis.com is_balancer=0: DNS query cancelled

### [REQUIRED] Step 2: Describe your environment

* Operating System version: Mac OS
* Firebase SDK version: 6.1.0
* Firebase Product: firestore
* Python version: 3.12.2
* Pip version: 24.0 from /Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/pip (python 3.12)

### [REQUIRED] Step 3: Describe the problem

```
cred = credentials.Certificate("firebase-privateKey.json")
firebase_admin.initialize_app(cred)
db = firestore.client()

collections = list(db.collections())
if collections:
print("Collections found:", [col.id for col in collections])
else:
print("No collections found or access denied.")
```

The code fails with error below.

```
Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/google/api_core/grpc_helpers.py", line 76, in error_remapped_callable
return callable_(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/grpc/_channel.py", line 1181, in __call__
return _end_unary_response_blocking(state, call, False, None)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/grpc/_channel.py", line 1006, in _end_unary_response_blocking
raise _InactiveRpcError(state) # pytype: disable=not-instantiable
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
grpc._channel._InactiveRpcError: <_InactiveRpcError of RPC that terminated with:
status = StatusCode.UNAVAILABLE
details = "DNS resolution failed for firestore.googleapis.com: C-ares status is not ARES_SUCCESS qtype=SRV name=_grpclb._tcp.firestore.googleapis.com: DNS query cancelled"
debug_error_string = "UNKNOWN:Error received from peer {grpc_message:"DNS resolution failed for firestore.googleapis.com: C-ares status is not ARES_SUCCESS qtype=SRV name=_grpclb._tcp.firestore.googleapis.com: DNS query cancelled", grpc_status:14, created_time:"2025-02-02T19:42:12.316149+09:00"}"
>

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/google/api_core/retry/retry_unary.py", line 144, in retry_target
result = target()
^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/google/api_core/timeout.py", line 130, in func_with_timeout
return func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/google/api_core/grpc_helpers.py", line 78, in error_remapped_callable
raise exceptions.from_grpc_error(exc) from exc
google.api_core.exceptions.ServiceUnavailable: 503 DNS resolution failed for firestore.googleapis.com: C-ares status is not ARES_SUCCESS qtype=SRV name=_grpclb._tcp.firestore.googleapis.com: DNS query cancelled

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/Users/tenna/Desktop/tenna/art_sanpo/scraping/museum.py", line 24, in
collections = list(db.collections())
^^^^^^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/google/cloud/firestore_v1/client.py", line 279, in collections
iterator = self._firestore_api.list_collection_ids(
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/google/cloud/firestore_v1/services/firestore/client.py", line 2057, in list_collection_ids
response = rpc(
^^^^
File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/google/api_core/gapic_v1/method.py", line 131, in __call__
return wrapped_func(*args, **kwargs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/google/api_core/retry/retry_unary.py", line 293, in retry_wrapped_func
return retry_target(
^^^^^^^^^^^^^
File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/google/api_core/retry/retry_unary.py", line 153, in retry_target
_retry_error_helper(
File "/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/google/api_core/retry/retry_base.py", line 221, in _retry_error_helper
raise final_exc from source_exc
google.api_core.exceptions.RetryError: Timeout of 60.0s exceeded, last exception: 503 DNS resolution failed for firestore.googleapis.com: C-ares status is not ARES_SUCCESS qtype=SRV name=_grpclb._tcp.firestore.googleapis.com: DNS query cancelled
```

I am running the script once a month, and It was working fine until 2025/1/5.
Suddenly stopped working yesterday (2025/2/1).

I can confirm the reject exists at: https://console.firebase.google.com/u/0/project/art-sanpo/overview?hl=ja
And the Blaze plan is turned on, access rule is `allow read: if true;` for all of the collections.