Fix update of reference for all compilers:

Since gcovr#686 the command `python3 -m nox -s 'docker_qa_compiler(all)' --reuse-existing-virtualenvs -- --update_reference` is working from newest to oldest version of compiler. Now the reuse of the test data doesn't work anymore.
Only the detection of the compiler shall use the newest one, all other commands shall start with oldest version first.

noxfile.py

@@ -29,15 +29,25 @@
 
 
 GCC_VERSIONS = [
-    "gcc-11",
-    "gcc-10",
-    "gcc-9",
-    "gcc-8",
-    "gcc-6",
     "gcc-5",
-    "clang-13",
+    "gcc-6",
+    "gcc-8",
+    "gcc-9",
+    "gcc-10",
+    "gcc-11",
     "clang-10",
+    "clang-13",
 ]
+
+GCC_VERSIONS_NEWEST_FIRST = [
+    "-".join(cc)
+    for cc in sorted(
+        [(*cc.split("-"),) for cc in GCC_VERSIONS],
+        key=lambda cc: (cc[0], int(cc[1])),
+        reverse=True,
+    )
+]
+
 DEFAULT_TEST_DIRECTORIES = ["doc", "gcovr"]
 DEFAULT_LINT_ARGUMENTS = [
     "setup.py",
@@ -58,7 +68,7 @@ def get_gcc_version_to_use():
         return os.path.split(cc)[1]
 
     # Find the first insalled compiler version we suport
-    for cc in GCC_VERSIONS:
+    for cc in GCC_VERSIONS_NEWEST_FIRST:
         if shutil.which(cc):
             return cc