faces/pulsometer: update copyrights and credits

Update the copyrights to include full name attribution to all
who contributed to the pulsometer watch face, including myself.

Also add an SPDX license identifier header comment to the files.

movement/watch_faces/complication/pulsometer_face.c

@@ -1,7 +1,11 @@
+/* SPDX-License-Identifier: MIT */
+
 /*
  * MIT License
  *
- * Copyright (c) 2022 Joey Castillo
+ * Copyright © 2021-2022 Joey Castillo <joeycastillo@utexas.edu> <jose.castillo@gmail.com>
+ * Copyright © 2023 Jeremy O'Brien <neutral@fastmail.com>
+ * Copyright © 2024 Matheus Afonso Martins Moreira <matheus.a.m.moreira@gmail.com> (https://www.matheusmoreira.com/)
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal

movement/watch_faces/complication/pulsometer_face.h

@@ -1,7 +1,12 @@
+/* SPDX-License-Identifier: MIT */
+
 /*
  * MIT License
  *
- * Copyright (c) 2022 Joey Castillo
+ * Copyright © 2021-2022 Joey Castillo <joeycastillo@utexas.edu> <jose.castillo@gmail.com>
+ * Copyright © 2022 Alexsander Akers <me@a2.io>
+ * Copyright © 2023 Alex Utter <ooterness@gmail.com>
+ * Copyright © 2024 Matheus Afonso Martins Moreira <matheus.a.m.moreira@gmail.com> (https://www.matheusmoreira.com/)
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal