apacheGH-36577: [Dev][C#] Use version-update:semver-major for some …

…packages (apache#36578)

### Rationale for this change

We want to consciously upgrade major versions for `Microsoft.Bcl.*`, `Microsoft.Extensions.*` and `System.*`.

### What changes are included in this PR?

Use `version-update:semver-major` for them.

### Are these changes tested?

No. I want to test this on main.

### Are there any user-facing changes?

No.
* Closes: apache#36577

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Eric Erhardt <eric.erhardt@microsoft.com>

.github/dependabot.yml

@@ -29,3 +29,13 @@ updates:
       interval: "weekly"
     commit-message:
       prefix: "MINOR: [C#] "
+    ignore:
+      - dependency-name: "Microsoft.Extensions.*"
+        update-types:
+          - "version-update:semver-major"
+      - dependency-name: "Microsoft.Bcl.*"
+        update-types:
+          - "version-update:semver-major"
+      - dependency-name: "System.*"
+        update-types:
+          - "version-update:semver-major"