Extend timeout for general unit tests to 60 min

The general unit tests job was timing out at 40 minutes. This change
increases the timeout to 60 minutes to allow the test suite to
complete successfully.

e.g. https://github.com/square/workflow-kotlin/actions/runs/19176422684/job/54823085604?pr=1429#logs

Author: tcmulcahy

.github/workflows/kotlin.yml

@@ -203,7 +203,7 @@ jobs:
     name: General Unit Tests (not KMP)
     runs-on: macos-latest
     needs: build-all
-    timeout-minutes: 40
+    timeout-minutes: 60
     steps:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2