Update Imath to v3.1.1 (#446)

Author: rbsheth

cmake/configs/default.cmake

@@ -80,7 +80,7 @@ hunter_default_version(ICU VERSION 63.1-p5)
 hunter_default_version(IF97 VERSION 2.1.2)
 hunter_default_version(Igloo VERSION 1.1.1-hunter)
 hunter_default_version(IlmBase VERSION 2.5.1-p0)
-hunter_default_version(Imath VERSION 3.0.1)
+hunter_default_version(Imath VERSION 3.1.1)
 hunter_default_version(Immer VERSION 0.6.2-cf44615)
 hunter_default_version(Jpeg VERSION 9c-p0)
 hunter_default_version(JsonSpirit VERSION 0.0.4-hunter)

cmake/projects/Imath/hunter.cmake

@@ -9,6 +9,17 @@ include(hunter_cmake_args)
 include(hunter_download)
 include(hunter_pick_scheme)
 
+hunter_add_version(
+    PACKAGE_NAME
+    Imath
+    VERSION
+    3.1.1
+    URL
+    "https://github.com/AcademySoftwareFoundation/Imath/archive/refs/tags/v3.1.1.tar.gz"
+    SHA1
+    1f6812637a1ec2a518cd4445ef31808fe1dc4a29
+)
+
 hunter_add_version(
     PACKAGE_NAME
     Imath