patch 9.0.1646: CI: codecov may take a very long time to run

Problem:    CI: codecov may take a very long time to run.
Solution:   Add a timeout. (Philip Heiduck, closes #12559)
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 4e6f23b..3481bcb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -238,6 +238,7 @@
           find . -type f -name '*.gcno' -exec gcov -pb {} + || true
 
       - name: Codecov
+        timeout-minutes: 20
         if: matrix.coverage
         uses: codecov/codecov-action@v3
         with:
@@ -610,6 +611,7 @@
           find . -type f -name '*.gcno' -exec gcov -pb {} + || true
 
       - name: Codecov
+        timeout-minutes: 20
         if: matrix.coverage
         uses: codecov/codecov-action@v3
         with:
diff --git a/src/version.c b/src/version.c
index 14ede7f..24ce994 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1646,
+/**/
     1645,
 /**/
     1644,