Update versions (wpilibsuite#376)

* Update versions and attribution

* remove unneeded attribution.txt

* ignore the attribution.txt since it isn't used

* Added comment explaining why the attribution.txt is excluded

Author: alan412

.gitignore

@@ -18,6 +18,11 @@ __pycache__/
 venv/
 *.egg-info
 
+# oss attribution text file
+# This is excluded because it is a duplicate of /oss-attribution/licenseInfos.json
+# The command npx generate-attribution generates both files and it was easier
+# to exclude it than to modify the script to delete the file
+/oss-attribution/attribution.txt
 
 # misc
 .DS_Store