fix: remove unused gitBlob method

Author: ppkarwasz

src/main/java/org/apache/commons/build/internal/GitUtils.java

@@ -46,21 +46,6 @@ public static String gitTree(Path path) throws IOException {
         return Hex.encodeHexString(DigestUtils.gitTree(digest, path));
     }
 
-    /**
-     * Returns the Git blob hash for the given file.
-     *
-     * @param path A regular file path.
-     * @return A hex-encoded SHA-1 blob hash.
-     * @throws IOException If the path is not a regular file or an I/O error occurs.
-     */
-    public static String gitBlob(Path path) throws IOException {
-        if (!Files.isRegularFile(path)) {
-            throw new IOException("Path is not a regular file: " + path);
-        }
-        MessageDigest digest = DigestUtils.getSha1Digest();
-        return Hex.encodeHexString(DigestUtils.gitBlob(digest, path));
-    }
-
     /**
      * Converts an SCM URI to a download URI suffixed with the current branch name.
      *