fix: compare version to SKBUILD properly (#314)

As seen in trying a pre0 release candidate

Author: nsmith-

tests/test_binding.py

@@ -7,6 +7,7 @@
 
 import correctionlib
 import correctionlib.schemav2 as cs
+import correctionlib.version
 
 
 @pytest.fixture(scope="module")
@@ -90,7 +91,8 @@ def test_cmake_static_compilation(csetstr: str):
             f.write(CMAKELIST_SRC)
         testprog = os.path.join(tmpdir, "test.cc")
         # SKBUILD_PROJECT_VERSION only includes major.minor.patch
-        versionstr = ".".join(correctionlib.__version__.split(".")[:3])
+        # it also trims any prerelease suffixes
+        versionstr = ".".join(map(str, correctionlib.version.__version_tuple__[:3]))
         with open(testprog, "w") as f:
             f.write(TESTPROG_SRC % (versionstr, csetstr))
         flags = (