Update to GCC 11.3 on Decent CI Linux Images

.decent_ci-Linux.yaml

@@ -1,12 +1,12 @@
 compilers:
   - name: "gcc"
-    version: "7.5"
+    version: "11.3"
     cmake_extra_flags: -DLINK_WITH_PYTHON:BOOL=ON -DPython_REQUIRED_VERSION:STRING=3.8 -DPython_ROOT_DIR:PATH=~/.pyenv/versions/3.8.12/ -DBUILD_FORTRAN:BOOL=ON -DBUILD_TESTING:BOOL=ON -DENABLE_REGRESSION_TESTING:BOOL=ON -DREGRESSION_BASELINE_PATH:PATH=$REGRESSION_BASELINE -DREGRESSION_SCRIPT_PATH:PATH=$REGRESSION_DIR -DREGRESSION_BASELINE_SHA:STRING=$REGRESSION_BASELINE_SHA -DCOMMIT_SHA:STRING=$COMMIT_SHA -DENABLE_GTEST_DEBUG_MODE:BOOL=OFF -DBUILD_PERFORMANCE_TESTS:BOOL=ON -DVALGRIND_ANALYZE_PERFORMANCE_TESTS:BOOL=ON -DENABLE_PCH:BOOL=OFF
     collect_performance_results: true
     s3_upload_bucket: energyplus
 
   - name: "gcc"
-    version: "7.5"
+    version: "11.3"
     build_type: Debug
     cmake_extra_flags: -DLINK_WITH_PYTHON:BOOL=ON -DPython_REQUIRED_VERSION:STRING=3.8 -DPython_ROOT_DIR:PATH=~/.pyenv/versions/3.8.12/ -DBUILD_FORTRAN:BOOL=ON -DBUILD_TESTING:BOOL=ON -DENABLE_REGRESSION_TESTING:BOOL=OFF -DCOMMIT_SHA:STRING=$COMMIT_SHA -DENABLE_COVERAGE:BOOL=ON -DENABLE_GTEST_DEBUG_MODE:BOOL=OFF -DENABLE_PCH:BOOL=OFF
     coverage_enabled: true
@@ -20,7 +20,7 @@ compilers:
     skip_packaging: true
 
   - name: "gcc"
-    version: "7.5"
+    version: "11.3"
     build_type: Debug
     cmake_extra_flags: -DLINK_WITH_PYTHON:BOOL=ON -DPython_REQUIRED_VERSION:STRING=3.8 -DPython_ROOT_DIR:PATH=~/.pyenv/versions/3.8.12/ -DBUILD_FORTRAN:BOOL=ON -DBUILD_TESTING:BOOL=ON -DENABLE_REGRESSION_TESTING:BOOL=OFF -DCOMMIT_SHA:STRING=$COMMIT_SHA -DENABLE_COVERAGE:BOOL=ON -DENABLE_GTEST_DEBUG_MODE:BOOL=OFF -DENABLE_PCH:BOOL=OFF
     coverage_enabled: true