ci: remove crate-ci/typos ignore from dependabot (#4597)

Packages should not pin crate-ci/typos; minor/patch updates should flow
through Dependabot automatically. Remove the typos ignore entry while
preserving the julia and github-actions ecosystem blocks.

Co-authored-by: ChrisRackauckas-Claude <accounts@chrisrackauckas.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: 3 people

.github/dependabot.yml

@@ -5,6 +5,3 @@ updates:
     directory: "/" # Location of package manifests
     schedule:
       interval: "weekly"
-    ignore:
-      - dependency-name: "crate-ci/typos"
-        update-types: ["version-update:semver-patch", "version-update:semver-minor"]