chore(ci): configure dependabot

<!-- ## READ BEFORE OPENING A PR Thank you for contributing to hugo-PaperMod! Please fill out the following questions to make it easier for us to review your changes. You do not need to check all the boxes below. **NOTE**: PaperMod does not have any external dependencies fetched from 3rd party CDN servers. However we do have custom Head/Footer extender templates which you can use to add those to your website. https://github.com/adityatelange/hugo-PaperMod/wiki/FAQs#custom-head--footer --> **What does this PR change? What problem does it solve?** The actions used by these workflows are outdated, that's why I added dependabot to send you updates. <!-- Describe the changes and their purpose here, as detailed as and if needed. Please do not add 2 unrelated changes in a single PR as it is difficult to track/revert those in future. --> **Was the change discussed in an issue or in the Discussions before?** This is related to #1851 — I figured, I could contribute this and maybe an additional workflow that nudges you to tag (like [release-please](https://github.com/googleapis/release-please-action)) and sets up the github release. <!-- Link issues and relevant Discussions posts here. Please create an issue or start a Discussion before opening a PR if you have not done so already. If this PR resolves an issue on GitHub, use "Closes #1234" so that the issue is closed automatically when this PR is merged. --> ## PR Checklist - [ ] This change adds/updates translations and I have used the [template present here](https://github.com/adityatelange/hugo-PaperMod/wiki/Translations#want-to-add-your-language-). - [x] I have enabled [maintainer edits for this PR](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/allowing-changes-to-a-pull-request-branch-created-from-a-fork). - [x] I have verified that the code works as described/as intended. - [ ] This change adds a Social Icon which has a permissive license to use it. - [x] This change **does not** include any CDN resources/links. - [x] This change **does not** include any unrelated scripts such as bash and python scripts. - [ ] This change updates the overridden internal templates from HUGO's repository.