Action is throwing error related to parsing flag keys

Hello,

I tried to setup the action today and got the following error:

```
Run growthbook/coderefs-action@2.11.5-14
Run curl -H "Authorization: Bearer " "***/api/v1/feature-keys" -o flags.json
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0
100 53 100 53 0 0 229 0 --:--:-- --:--:-- --:--:-- 229
Run echo "flags.json" >> .gbignore
Run growthbook/coderefs-standalone-action@2.11.5-12
/usr/bin/docker run --name f53a983749604837c6417399cc2ed888165387_e57134 --label f53a98 --workdir /github/workspace --rm -e "INPUT_FLAGSPATH" -e "INPUT_DIR" -e "INPUT_BRANCH" -e "INPUT_REPONAME" -e "INPUT_CONTEXTLINES" -e "INPUT_DEBUG" -e "INPUT_LOOKBACK" -e "INPUT_ALLOWTAGS" -e "INPUT_OUTFILE" -e "GB_FLAGS_PATH" -e "GB_DIR" -e "GB_BRANCH" -e "GB_OUT_FILE" -e "GB_CONTEXT_LINES" -e "GB_ALLOW_TAGS" -e "GB_DEBUG" -e "GB_LOOKBACK" -e "GB_REPO_NAME" -e "HOME" -e "GITHUB_JOB" -e "GITHUB_REF" -e "GITHUB_SHA" -e "GITHUB_REPOSITORY" -e "GITHUB_REPOSITORY_OWNER" -e "GITHUB_REPOSITORY_OWNER_ID" -e "GITHUB_RUN_ID" -e "GITHUB_RUN_NUMBER" -e "GITHUB_RETENTION_DAYS" -e "GITHUB_RUN_ATTEMPT" -e "GITHUB_REPOSITORY_ID" -e "GITHUB_ACTOR_ID" -e "GITHUB_ACTOR" -e "GITHUB_TRIGGERING_ACTOR" -e "GITHUB_WORKFLOW" -e "GITHUB_HEAD_REF" -e "GITHUB_BASE_REF" -e "GITHUB_EVENT_NAME" -e "GITHUB_SERVER_URL" -e "GITHUB_API_URL" -e "GITHUB_GRAPHQL_URL" -e "GITHUB_REF_NAME" -e "GITHUB_REF_PROTECTED" -e "GITHUB_REF_TYPE" -e "GITHUB_WOR

WARNING: The requested image's platform (linux/arm64/v8) does not match the detected host platform (linux/amd64/v3) and no specific platform was requested

INFO: 2025/01/30 16:39:13 coderefs.go:25: absolute directory path: /github/workspace
INFO: 2025/01/30 16:39:13 git.go:47: git branch:
ERROR: 2025/01/30 16:39:13 flags.go:19: could not parse flag keys: json: cannot unmarshal object into Go value of type []string
```

Perhaps the flag payload schema has changed and the code wasn't updated to handle it? Thanks.