Bump minimum gcc version to 11.4 (ubuntu1 runner).

Does not compile with gcc 10.2 anymore after !4992. See e.g.
https://gitlab.opengeosys.org/ogs/ogs/-/jobs/442490.

web/data/versions.json

 {
   "minimum_version": {
-    "gcc": "10.2.0",
+    "gcc": "11.4.0",
     "clang": "13.0",
     "apple_clang": "13.1.6",
     "msvc": {