Update version to v3.5.1

Author: chad-earthscope

ChangeLog

@@ -1,4 +1,4 @@
-2026.206:
+2026.206: v3.5.1
   - Set MS3RecordPtr.msr->record to NULL when the raw record is not available,
     instead of leaving it dangling to a source buffer that may be freed or
     reused.

libmseed.h

@@ -17,7 +17,7 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
- * Copyright (C) 2025:
+ * Copyright (C) 2026:
  * @author Chad Trabant, EarthScope Data Services
  ***************************************************************************/
 
@@ -29,8 +29,8 @@ extern "C"
 {
 #endif
 
-#define LIBMSEED_VERSION "3.5.0"    //!< Library version
-#define LIBMSEED_RELEASE "2026.205" //!< Library release date
+#define LIBMSEED_VERSION "3.5.1"    //!< Library version
+#define LIBMSEED_RELEASE "2026.206" //!< Library release date
 
 /** @defgroup io-functions File and URL I/O */
 /** @defgroup miniseed-record Record Handling */