Add support for GCC 13 and 14 on RHEL 9.4 (#36)

Author: bthomee

.github/workflows/rhel.yml

@@ -39,6 +39,12 @@ jobs:
           - release: 9.4
             compiler_name: gcc
             compiler_version: 12
+          - release: 9.4
+            compiler_name: gcc
+            compiler_version: 13
+          - release: 9.4
+            compiler_name: gcc
+            compiler_version: 14
           - release: 9.6
             compiler_name: gcc
             compiler_version: 13
@@ -140,6 +146,12 @@ jobs:
           - release: 9.4
             compiler_name: gcc
             compiler_version: 12
+          - release: 9.4
+            compiler_name: gcc
+            compiler_version: 13
+          - release: 9.4
+            compiler_name: gcc
+            compiler_version: 14
           - release: 9.6
             compiler_name: gcc
             compiler_version: 13