Use a different concurrency group name
.. the other one is haunted.  Closes
Also upgrades actions/checkout to one that doesn't warn
```
Warning: The `save-state` command is deprecated and will be disabled soon.
Please upgrade to using Environment Files.
For more information see:
```
@@ -8,7 +8,7 @@ on:
branches: [main]
concurrency:
- group: folder-images
+ group: folder-images-concurrency # https://github.com/adafruit/Adafruit_Learning_System_Guides/issues/2327
cancel-in-progress: true
jobs:
@@ -21,7 +21,7 @@ jobs:
GITHUB_CONTEXT: ${{ toJson(github) }}
run: echo "$GITHUB_CONTEXT"
- - uses: actions/checkout@v2.2.0
+ - uses: actions/checkout@v3
- name: Set up Python 3.x
uses: actions/setup-python@v4
