Avoid Wzero-as-null-pointer-constant warning (#75)

Newer compilers may warn when using `0`, e.g.:
```
./boost/iterator/detail/facade_iterator_category.hpp:161:5: error: zero as null pointer constant [-Werror,-Wzero-as-null-pointer-constant]
    BOOST_MPL_ASSERT_NOT((is_iterator_category<Traversal>));
    ^
./boost/mpl/assert.hpp:324:58: note: expanded from macro 'BOOST_MPL_ASSERT_NOT'
              boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \
```

.github/workflows/ci.yml

@@ -131,20 +131,23 @@ jobs:
             fi
             git config --global pack.threads 0
 
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
         with:
           # For coverage builds fetch the whole history, else only 1 commit using a 'fake ternary'
           fetch-depth: ${{ matrix.coverage && '0' || '1' }}
 
       - name: Cache ccache
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         if: env.B2_USE_CCACHE
         with:
           path: ~/.ccache
-          key: ${{matrix.os}}-${{matrix.container}}-${{matrix.compiler}}
+          key: ${{matrix.os}}-${{matrix.container}}-${{matrix.compiler}}-${{github.sha}}
+          restore-keys: |
+            ${{matrix.os}}-${{matrix.container}}-${{matrix.compiler}}-
+            ${{matrix.os}}-${{matrix.container}}-${{matrix.compiler}}
 
       - name: Fetch Boost.CI
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
         with:
           repository: boostorg/boost-ci
           ref: master

include/boost/mpl/assert.hpp

@@ -297,7 +297,7 @@ BOOST_MPL_AUX_ASSERT_CONSTANT( \
       std::size_t \
     , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
           boost::mpl::assertion_failed<false>( \
-              boost::mpl::assert_arg( (void (*) pred)0, 1 ) \
+              boost::mpl::assert_arg( (void (*) pred)BOOST_NULLPTR, 1 ) \
             ) \
         ) \
     ) \
@@ -310,7 +310,7 @@ BOOST_MPL_AUX_ASSERT_CONSTANT( \
 enum { \
       BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
           boost::mpl::assertion<false>::failed( \
-              boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \
+              boost::mpl::assert_not_arg( (void (*) pred)BOOST_NULLPTR, 1 ) \
             ) \
         ) \
 }\
@@ -321,7 +321,7 @@ BOOST_MPL_AUX_ASSERT_CONSTANT( \
       std::size_t \
     , BOOST_PP_CAT(mpl_assertion_in_line_,BOOST_MPL_AUX_PP_COUNTER()) = sizeof( \
           boost::mpl::assertion_failed<false>( \
-              boost::mpl::assert_not_arg( (void (*) pred)0, 1 ) \
+              boost::mpl::assert_not_arg( (void (*) pred)BOOST_NULLPTR, 1 ) \
             ) \
         ) \
    ) \