ci: Add missing workflow dependencies (#2155)

Was discovered in https://github.com/XRPLF/clio/pull/2150, better to be
fixed separately, as I'm not sure it'll be merged.

.github/workflows/build.yml

@@ -18,6 +18,7 @@ on:
       - "!.github/actions/create_issue/**"
 
       - CMakeLists.txt
+      - conanfile.py
       - "cmake/**"
       - "src/**"
       - "tests/**"

.github/workflows/nightly.yml

@@ -11,6 +11,7 @@ on:
       - .github/workflows/release_impl.yml
       - .github/workflows/build_and_test.yml
       - .github/workflows/build_impl.yml
+      - .github/workflows/test_impl.yml
       - .github/workflows/build_clio_docker_image.yml
 
       - ".github/actions/**"

.github/workflows/sanitizers.yml

@@ -18,6 +18,7 @@ on:
       - .github/scripts/execute-tests-under-sanitizer
 
       - CMakeLists.txt
+      - conanfile.py
       - "cmake/**"
       # We don't run sanitizer on code change, because it takes too long
       # - "src/**"