Toolchain: Update build images

Author: Simran-B

.circleci/generate_config.py

@@ -143,9 +143,9 @@ def workflow_generate(config):
                 elif openssl.startswith("1.1"):
                     compileJob["compile-linux"]["build-image"] = "arangodb/build-alpine-x86_64:3.16-gcc11.2-openssl1.1.1s"
                 else:
-                    compileJob["compile-linux"]["build-image"] = "arangodb/ubuntubuildarangodb-311:1" # clang-16
-            else: # build image for 3.12.5 and devel as of 2025-02-04
-                compileJob["compile-linux"]["build-image"] = "arangodb/ubuntubuildarangodb-devel:11" # clang-19
+                    compileJob["compile-linux"]["build-image"] = "arangodb/ubuntubuildarangodb-311:6" # clang-16
+            else: # build image for 3.12.7 and devel as of 2025-12-11
+                compileJob["compile-linux"]["build-image"] = "arangodb/ubuntubuildarangodb-devel:18" # clang-19
 
         print(f"compileJob = {compileJob}")
 
@@ -249,9 +249,9 @@ def workflow_release_arangodb(config):
         elif openssl.startswith("1.1"):
             compileJob["compile-linux"]["build-image"] = "arangodb/build-alpine-x86_64:3.16-gcc11.2-openssl1.1.1s"
         else:
-            compileJob["compile-linux"]["build-image"] = "arangodb/ubuntubuildarangodb-devel:9" # 3.11.13
-    else: # build image for 3.12.4 and devel as of 2024-11-25
-        compileJob["compile-linux"]["build-image"] = "arangodb/ubuntubuildarangodb-devel:9"
+            compileJob["compile-linux"]["build-image"] = "arangodb/ubuntubuildarangodb-311:6" # clang-16
+    else: # build image for 3.12.7 and devel as of 2024-12-11
+        compileJob["compile-linux"]["build-image"] = "arangodb/ubuntubuildarangodb-devel:18" # clang-19
 
     config["jobs"]["compile-linux"]["steps"].append({
         "compile-and-dockerize-arangodb": {