test-fru-utils: fix clang-tidy error

clang-tidy-19 suggests making a trivial reserve call due to a sequence
of push_back calls in the test case.  Add as directed.

```
../test/test_fru-utils.cpp:173:9: error: 'push_back' is called inside a loop; consider pre-allocating the container capacity before the loop [performance-inefficient-vector-operation,-warnings-as-errors]
```

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ia453674492b0ca5fb3b56fd2bf5326b3c1ca7f86
diff --git a/test/test_fru-utils.cpp b/test/test_fru-utils.cpp
index 9470e4c..70330a7 100644
--- a/test/test_fru-utils.cpp
+++ b/test/test_fru-utils.cpp
@@ -168,6 +168,7 @@
 TEST(FRUReaderTest, ReadData)
 {
     std::vector<uint8_t> data = {};
+    data.reserve(blockSize * 2);
     for (size_t i = 0; i < blockSize * 2; i++)
     {
         data.push_back(i);