CI: bump 'latest versions' test to the newest openexr release (#3796)

Author: lgritz

.github/workflows/ci.yml

@@ -238,7 +238,7 @@ jobs:
             cxx_compiler: g++-11
             cxx_std: 17
             fmt_ver: 9.1.0
-            openexr_ver: v3.1.6
+            openexr_ver: v3.1.7
             pybind11_ver: v2.10.0
             python_ver: "3.10"
             simd: avx2,f16c