Configure Renovate (#1478)

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Welcome to [Renovate](https://togithub.com/renovatebot/renovate)! This
is an onboarding PR to help you understand and configure settings before
regular Pull Requests begin.

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simply close this Pull Request unmerged.

---
### Detected Package Files

 * `Cargo.toml` (cargo)
 * `cargo-embed/Cargo.toml` (cargo)
 * `cargo-flash/Cargo.toml` (cargo)
 * `cli/Cargo.toml` (cargo)
 * `debugger/Cargo.toml` (cargo)
 * `gdb-server/Cargo.toml` (cargo)
 * `probe-rs-cli-util/Cargo.toml` (cargo)
 * `probe-rs-target/Cargo.toml` (cargo)
 * `probe-rs/Cargo.toml` (cargo)
 * `rtthost/Cargo.toml` (cargo)
 * `smoke-tester/Cargo.toml` (cargo)
 * `target-gen/Cargo.toml` (cargo)
 * `xtask/Cargo.toml` (cargo)
 * `.github/actions/setup/action.yml` (github-actions)
 * `.github/workflows/changelog.yml` (github-actions)
 * `.github/workflows/ci.yml` (github-actions)
 * `.github/workflows/release.yml` (github-actions)
 * `.github/workflows/start-release.yml` (github-actions)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Dominik Boehi <dboehi@fastmail.com>

renovate.json

@@ -0,0 +1,7 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:base",
+    "group:allNonMajor"
+  ]
+}