chore(ci): update renovate to v44.0.2 and remove codecov integration

- Update renovatebot/github-action from v40.3.12 to v44.0.2
- Remove codecov upload step (not needed for proprietary project)

Author: mikkihugo

.github/workflows/ci.yml

@@ -111,13 +111,6 @@ jobs:
         run: |
           nix develop --command cargo tarpaulin --out xml --all-features --verbose
 
-      - name: Upload Coverage
-        uses: codecov/codecov-action@v4
-        with:
-          files: ./cobertura.xml
-          fail_ci_if_error: false
-        continue-on-error: true
-
   # MSRV check (use specific Rust version, can't do this easily in Nix)
   # Only run on main branch pushes, scheduled runs, and manual triggers - not every PR
   msrv:

.github/workflows/renovate.yml

@@ -68,7 +68,7 @@ jobs:
         continue-on-error: true
 
       - name: Self-hosted Renovate
-        uses: renovatebot/github-action@v40.3.12
+        uses: renovatebot/github-action@v44.0.2
         env:
           # Use GitHub App token if available, otherwise use GITHUB_TOKEN
           RENOVATE_TOKEN: ${{ steps.get_token.outputs.token || secrets.GITHUB_TOKEN }}