chore: do not run CCI on release-please branches (AztecProtocol#3984)

Without this PR, the [release-please branch re-runs CCI whenever someone
merges a
PR](https://app.circleci.com/pipelines/github/AztecProtocol/aztec-packages?branch=release-please--branches--master).

This PR makes it so that we never perform work in CCI on release-please
branches.

.circleci/config.yml

@@ -245,7 +245,7 @@ jobs:
       # NOTE: we usually use alpine build image when making spot images, but
       # we are not able to upload to S3 with it
       image: ubuntu-2204:2023.07.2
-    resource_class: medium 
+    resource_class: medium
     steps:
       - *checkout
       - *setup_env
@@ -1059,6 +1059,11 @@ defaults: &defaults
   filters:
     tags:
       only: /^aztec-packages-v.*/
+    branches:
+      ignore:
+        - /^release-please--.*/
+      only:
+        - /.*/
   context:
     - build
     - slack