fix: Use less ambiguous "kB" for SI kilobyte

`gix free pack verify --statistics` formerly used "KB" for
kilobytes (i.e., SI decimal kilobytes, units of 1000 bytes). This
was somewhat ambiguous because it is occasionally also used for
kibibytes (i.e., IEC binary kibibytes, units of 1024 bytes).

Kilobytes and kibibytes can be more precisely distinguished by
using kB for kilobytes (since "k" is the SI prefix for "kilo") and
KiB for kibibytes (since decimal kilobytes are never written KiB).

This adapts `gitoxide-core` to changes in `bytesize` and, in so
doing, allows the SI unit symbol "kB" to be used.

Fixes #1947

Author: EliahKagan

Diff for: gitoxide-core/src/pack/verify.rs

@@ -236,10 +236,10 @@ fn print_statistics(out: &mut impl io::Write, stats: &index::traverse::Statistic
     #[rustfmt::skip]
     writeln!(
         out, "\t{:<width$}: {}\n\t{:<width$}: {}\n\t{:<width$}: {}\n\t{:<width$}: {}",
-        "compressed entries size", ByteSize(stats.total_compressed_entries_size),
-        "decompressed entries size", ByteSize(stats.total_decompressed_entries_size),
-        "total object size", ByteSize(stats.total_object_size),
-        "pack size", ByteSize(stats.pack_size),
+        "compressed entries size", ByteSize(stats.total_compressed_entries_size).display().si(),
+        "decompressed entries size", ByteSize(stats.total_decompressed_entries_size).display().si(),
+        "total object size", ByteSize(stats.total_object_size).display().si(),
+        "pack size", ByteSize(stats.pack_size).display().si(),
         width = width
     )?;
     #[rustfmt::skip]

Diff for: tests/snapshots/plumbing/no-repo/pack/verify/index-with-statistics-success

@@ -15,10 +15,10 @@ averages
 	decompressed object size [B]:  9621;
 
 compression
-	compressed entries size       : 51.8 KB
-	decompressed entries size     : 103.7 KB
-	total object size             : 288.7 KB
-	pack size                     : 51.9 KB
+	compressed entries size       : 51.8 kB
+	decompressed entries size     : 103.7 kB
+	total object size             : 288.7 kB
+	pack size                     : 51.9 kB
 
 	num trees                     : 15
 	num blobs                     : 5

Diff for: tests/snapshots/plumbing/no-repo/pack/verify/multi-index/index-with-statistics-success

@@ -16,10 +16,10 @@ averages
 	decompressed object size [B]:  9621;
 
 compression
-	compressed entries size       : 51.8 KB
-	decompressed entries size     : 103.7 KB
-	total object size             : 288.7 KB
-	pack size                     : 51.9 KB
+	compressed entries size       : 51.8 kB
+	decompressed entries size     : 103.7 kB
+	total object size             : 288.7 kB
+	pack size                     : 51.9 kB
 
 	num trees                     : 15
 	num blobs                     : 5
@@ -43,10 +43,10 @@ averages
 	decompressed object size [B]:  2093;
 
 compression
-	compressed entries size       : 48.9 KB
-	decompressed entries size     : 132.8 KB
-	total object size             : 140.2 KB
-	pack size                     : 49.1 KB
+	compressed entries size       : 48.9 kB
+	decompressed entries size     : 132.8 kB
+	total object size             : 140.2 kB
+	pack size                     : 49.1 kB
 
 	num trees                     : 2
 	num blobs                     : 63