ci/cd: dependabot: change commit message

[Kamil Samigullin]

Motivation: to be precise.

• directory: / -> deps:
• directory: /docs/ -> deps: docs: or docs: deps:
• directory: /tools/ -> deps: tools: or tools: deps:
• github-actions -> deps: ci/cd: or ci/cd: deps:

See the docs https://docs.github.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#commit-message.
Don't forget about https://www.conventionalcommits.org/en/v1.0.0/.