chore(deps): update dependency erlang to v28

renovate[bot] · web-flow · commit 7e4d6fa82226 · 2026-03-05T11:24:58.000Z
diff --git a/.tool-versions b/.tool-versions
@@ -1,2 +1,2 @@
 elixir 1.15.7-otp-26
-erlang 26.1
+erlang 28.4
diff --git a/libs/astarte_generators/.tool-versions b/libs/astarte_generators/.tool-versions
@@ -1,2 +1,2 @@
 elixir 1.15.7-otp-26
-erlang 26.1
+erlang 28.4
