Issue #19520: Fix (the last!) compiler warning on 32bit Windows, in _sha3

Misc/NEWS

@@ -285,6 +285,8 @@ Tests
 Build
 -----
 
+- Issue #19520: Fix compiler warning in the _sha3 module on 32bit Windows.
+
 - Issue #19356: Avoid using a C variabled named "_self", it's a reserved
   word in some C compilers.
 

Modules/_sha3/keccak/KeccakF-1600-opt32.c

@@ -212,7 +212,7 @@ static void setInterleavedWordsInto8bytes(UINT8* dest, UINT32* evenAndOdd)
 
 #define extractLanes(laneCount, state, data) \
     { \
-        int i; \
+        unsigned int i; \
         for(i=0; i<(laneCount); i++) \
             setInterleavedWordsInto8bytes(data+i*8, (UINT32*)state+i*2); \
     }