images: don't update based on pushes to master

This causes build failures, because these are usually the "automated
update by adabot", and when the workflow runs the new release has
been created but the metadata is not yet available.

Instead, rely on the cron coming a few hours after adabot so that
the metadata is created & ready.

Typical failure:
```
Requesting redirect information: https://github.com/adafruit/Adafruit_CircuitPython_Bundle/releases/latest
Tag: '20210531'
New version available 20210531.
get bundle metadata from https://adafruit-circuit-python.s3.amazonaws.com/bundles/adafruit/adafruit-circuitpython-bundle-20210531.json
    from get_imports import (
  File "/home/runner/work/Adafruit_CircuitPython_Bundle/Adafruit_CircuitPython_Bundle/CircuitPython_Library_Screenshot_Maker/get_imports.py", line 107, in <module>
    bundle_data = json.load(f)
  File "/opt/hostedtoolcache/Python/3.9.5/x64/lib/python3.9/json/__init__.py", line 293, in load
    return loads(fp.read(),
  File "/opt/hostedtoolcache/Python/3.9.5/x64/lib/python3.9/json/__init__.py", line 346, in loads
    return _default_decoder.decode(s)
  File "/opt/hostedtoolcache/Python/3.9.5/x64/lib/python3.9/json/decoder.py", line 337, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/opt/hostedtoolcache/Python/3.9.5/x64/lib/python3.9/json/decoder.py", line 355, in raw_decode
    raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
```

.github/workflows/images.yml

@@ -4,8 +4,6 @@ on:
   schedule:
     - cron: '0 10 * * *'
   workflow_dispatch:
-  push:
-    branches: [master]
 
 concurrency:
   group: folder-images

libraries/drivers/si4713

@@ -1 +1 @@
-Subproject commit f919f42db2a62fd68d05722ca3253ba407fd1624
+Subproject commit 27b350975aff943d1fca220a809da63293350abf

libraries/helpers/portalbase

@@ -1 +1 @@
-Subproject commit 16f68f1987ecf72c4dccbdcf2289970c85c42f9a
+Subproject commit 9d180931ef6de1a9b484eeb301f312824dbd0a91