Workaround sqlite 3.53.0 regression on sqlite3_mprintf()

See https://sqlite.org/forum/forumpost/e2421578f4

Breaks the factory.objectInsertion unit test, or more generally if
using getInsertStatementsFor() with a geodetic datum with an anchor
epoch. Which shouldn't affect that many people

Author: rouault

src/iso19111/factory.cpp

@@ -2231,7 +2231,7 @@ std::vector<std::string> DatabaseContext::Private::getInsertStatementsFor(
 // ---------------------------------------------------------------------------
 
 static std::string anchorEpochToStr(double val) {
-    constexpr int BUF_SIZE = 16;
+    constexpr int BUF_SIZE = 32;
     char szBuffer[BUF_SIZE];
     sqlite3_snprintf(BUF_SIZE, szBuffer, "%.3f", val);
     return szBuffer;