ci(release-please): always-bump-patch (#1029)

Switch to `always-bump-patch` versioning to bump minor explicitly via

```bash
git commit --allow-empty -m "chore: release 1.1.0" -m "Release-As: 1.1.0"
```


([source](https://github.com/googleapis/release-please#how-do-i-change-the-version-number))

Author: ishymko

.github/workflows/release-please.yml

@@ -16,4 +16,5 @@ jobs:
       - uses: googleapis/release-please-action@16a9c90856f42705d54a6fda1823352bdc62cf38 # v4
         with:
           token: ${{ secrets.A2A_BOT_PAT }}
-          release-type: python
+          config-file: release-please-config.json
+          manifest-file: .release-please-manifest.json

.release-please-manifest.json

@@ -0,0 +1,3 @@
+{
+  ".": "1.0.2"
+}

release-please-config.json

@@ -0,0 +1,9 @@
+{
+  "release-type": "python",
+  "include-component-in-tag": false,
+  "packages": {
+    ".": {
+      "versioning": "always-bump-patch"
+    }
+  }
+}