Update default main net to nn-74f1d263ae9a.nnue

Created by setting output weights (256) and biases (8) of the previous main net
nn-ddcfb9224cdb.nnue to values found around 12k / 120k spsa games at 120+1.2

This used modified fishtest dev workers to construct .nnue files from
spsa params, then load them with EvalFile when running tests:
https://github.com/linrock/fishtest/tree/spsa-file-modified-nnue/worker

Inspired by researching loading spsa params from files:
https://github.com/official-stockfish/fishtest/pull/1926

Scripts for modifying nnue files and preparing params:
https://github.com/linrock/nnue-pytorch/tree/no-gpu-modify-nnue

spsa params:
  weights: [-127, 127], c_end = 6
  biases: [-8192, 8192], c_end = 64

Example of reading output weights and biases from the previous main net using
nnue-pytorch and printing spsa params in a format compatible with fishtest:

```
import features
from serialize import NNUEReader

feature_set = features.get_feature_set_from_name("HalfKAv2_hm")
with open("nn-ddcfb9224cdb.nnue", "rb") as f:
    model = NNUEReader(f, feature_set).model

c_end_weights = 6
c_end_biases = 64

for i in range(8):
    for j in range(32):
        value = round(int(model.layer_stacks.output.weight[i, j] * 600 * 16) / 127)
        print(f"oW[{i}][{j}],{value},-127,127,{c_end_weights},0.0020")

for i in range(8):
    value = int(model.layer_stacks.output.bias[i] * 600 * 16)
    print(f"oB[{i}],{value},-8192,8192,{c_end_biases},0.0020")
```

For more info on spsa tuning params in nets:
https://github.com/official-stockfish/Stockfish/pull/5149
https://github.com/official-stockfish/Stockfish/pull/5254

Passed STC:
https://tests.stockfishchess.org/tests/view/66894d64e59d990b103f8a37
LLR: 2.94 (-2.94,2.94) <0.00,2.00>
Total: 32000 W: 8443 L: 8137 D: 15420
Ptnml(0-2): 80, 3627, 8309, 3875, 109

Passed LTC:
https://tests.stockfishchess.org/tests/view/6689668ce59d990b103f8b8b
LLR: 2.94 (-2.94,2.94) <0.50,2.50>
Total: 172176 W: 43822 L: 43225 D: 85129
Ptnml(0-2): 97, 18821, 47633, 19462, 75

closes https://github.com/official-stockfish/Stockfish/pull/5459

bench 1120091

src/evaluate.h

@@ -33,7 +33,7 @@ namespace Eval {
 // for the build process (profile-build and fishtest) to work. Do not change the
 // name of the macro or the location where this macro is defined, as it is used
 // in the Makefile/Fishtest.
-#define EvalFileDefaultNameBig "nn-ddcfb9224cdb.nnue"
+#define EvalFileDefaultNameBig "nn-74f1d263ae9a.nnue"
 #define EvalFileDefaultNameSmall "nn-37f18f62d772.nnue"
 
 namespace NNUE {