big.int.depositBits: fix handling of different limb counts

Author: bnuuydev

lib/std/math/big/int.zig

@@ -1771,7 +1771,7 @@ pub const Mutable = struct {
         @memset(result.limbs, 0);
 
         var shift: usize = 0;
-        for (mask.limbs, result.limbs) |mask_limb, *result_limb| {
+        for (mask.limbs, result.limbs[0..mask.limbs.len]) |mask_limb, *result_limb| {
             const shift_bits: Log2Limb = @intCast(shift % limb_bits);
             const shift_limbs = shift / limb_bits;