Dependabot commit prefixes double the scope and use a type the PR title check rejects

[RAprogramm]

Now that .github/dependabot.yml is schema-valid (#266, #268) Dependabot honours commit-message, and the current settings produce broken titles:

• github-actions: prefix: "ci(deps)" + include: scope → ci(deps)(deps): bump … (see ci(deps): bump the actions group across 1 directory with 8 updates #270)
• cargo: prefix: "deps(cargo)" + include: scope → deps(cargo)(deps): bump …, and deps is not an accepted type in the PR title check (feat|fix|docs|ci|chore|refactor|test|perf|build), so every cargo bump would fail CI

Fix: use bare types as prefixes — ci for github-actions and chore for cargo — and let include: scope add (deps) / (deps-dev). The changelog already groups Dependabot commits by author and also matches chore(deps).