Update and fix greetings workflow

[Marcono1234]

Closes #157

Based on the usage example in the README:
https://github.com/actions/first-interaction/tree/v3.1.0?tab=readme-ov-file#usage

For me the workflow was previously failing when I created my first issue in this repository here:
https://github.com/azagniotov/language-detection/actions/runs/18820093258/job/53694233157

...
Checking if its the users first contribution
Adding message: Thanks for opening your first issue. Pull requests are always welcome too! :) to issue 166
Error: Resource not accessible by integration - https://docs.github.com/rest/issues/comments#create-an-issue-comment

I am not completely sure if this change fully solves the problem for external contributors. Because normally pull_request runs with read-only permissions (which cannot be increased to write permission, e.g. pull-requests: write), unless GitHub added some special casing for actions/first-interaction?
But let's see once you approve the workflows for this PR whether the workflow is able to add a comment here.

[Marcono1234]

Sorry for the CI failure. Apparently the inputs names for actions/first-interaction were changed but their README had not been updated (see also actions/first-interaction#368).
Have changed the inputs names now.
Though unfortunately we will probably not see now whether this greetings workflow really works, until the next new contributor creates a PR.

Regarding the dependency-submission failure; probably that job should only run for push events, not for pull requests, right?