tinyexr: Sync with upstream 1.0.2

Fixes a bunch of bugs, notably addressing fuzzer reports (crashes).
https://github.com/syoyo/tinyexr/releases/tag/v1.0.2

(cherry picked from commit c5834eb9720b73a9f83752e7dafbee1c19c059b6)

thirdparty/README.md

@@ -538,7 +538,7 @@ comments and a patch is provided in the squish/ folder.
 ## tinyexr
 
 - Upstream: https://github.com/syoyo/tinyexr
-- Version: 1.0.1 (67010eae802211202d0797f4df2b809f4ba7442c, 2021)
+- Version: 1.0.2 (02310c77e5156c36fedf6cf810c4071e3f83906f, 2023)
 - License: BSD-3-Clause
 
 Files extracted from upstream source: