Run cifuzz.yml on pull requests for CMakeLists.txt

All the other CI workflows that run on pull requests for 'cmake/**' also
run on pull requests for '**CMakeLists.txt'. So cifuzz.yml is the only
exception.

.github/workflows/cifuzz.yml

diff --git a/.github/workflows/cifuzz.yml b/.github/workflows/cifuzz.yml
index 72c134d..c6c0c4b 100644
--- a/.github/workflows/cifuzz.yml
+++ b/.github/workflows/cifuzz.yml
@@ -4,6 +4,7 @@
   pull_request:
     paths:
       - '.github/workflows/cifuzz.yml'
+      - '**CMakeLists.txt'
       - 'cmake/**'
       - 'ext/**'
       - 'tests/gtest/**'