Remove duplicate govulncheck from test.yml

govulncheck runs identically in both test.yml and security.yml.
security.yml covers the same triggers (push to main, pull_request)
plus a weekly schedule, making the test.yml copy redundant.

Author: jeremy

.github/workflows/test.yml

@@ -247,25 +247,6 @@ jobs:
           version: latest
           args: --config .golangci.yml
 
-  security:
-    name: Security
-    runs-on: ubuntu-latest
-    defaults:
-      run:
-        working-directory: go
-    steps:
-      - uses: actions/checkout@v6
-
-      - name: Set up Go
-        uses: actions/setup-go@v6
-        with:
-          go-version-file: 'go/go.mod'
-
-      - name: Run govulncheck
-        run: |
-          go install golang.org/x/vuln/cmd/govulncheck@latest
-          govulncheck ./...
-
   race:
     name: Race Detection
     runs-on: ubuntu-latest