♻️ Refactor cocurrency model on backend

Mainly the followin changes:

- Pass majority of code to the old and plain synchronous style
  and start using virtual threads for the RPC (and partially some
  HTTP server middlewares).
- Make some improvements on how CLIMIT is handled, simplifying code
- Improve considerably performance reducing the reflection and
  unnecesary funcion calls on the whole stack-trace of an RPC call.
- Improve efficiency reducing considerably the total threads number.

backend/deps.edn

@@ -1,4 +1,7 @@
-{:deps
+{:mvn/repos
+ {"sonatype" {:url "https://oss.sonatype.org/content/repositories/snapshots/"}}
+
+ :deps
  {penpot/common {:local/root "../common"}
   org.clojure/clojure {:mvn/version "1.11.1"}
   org.clojure/core.async {:mvn/version "1.6.673"}
@@ -19,14 +22,16 @@
   java-http-clj/java-http-clj {:mvn/version "0.4.3"}
 
   funcool/yetti
-  {:git/tag "v9.13"
-   :git/sha "e2d25db"
+  {:git/tag "v9.15"
+   :git/sha "aa9b967"
    :git/url "https://github.com/funcool/yetti.git"
    :exclusions [org.slf4j/slf4j-api]}
 
   com.github.seancorfield/next.jdbc {:mvn/version "1.3.847"}
   metosin/reitit-core {:mvn/version "0.5.18"}
-  org.postgresql/postgresql {:mvn/version "42.5.2"}
+
+  org.postgresql/postgresql {:mvn/version "42.6.0-SNAPSHOT"}
+
   com.zaxxer/HikariCP {:mvn/version "5.0.1"}
 
   io.whitfin/siphash {:mvn/version "2.0.0"}