chore: bump version to 1.3.1 [skip ci]

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

CHANGELOG.md

@@ -1,3 +1,13 @@
+## [v1.3.1](https://github.com/docling-project/docling-serve/releases/tag/v1.3.1) - 2025-08-21
+
+### Fix
+
+* Configuration and performance fixes via upgrade of packages ([#328](https://github.com/docling-project/docling-serve/issues/328)) ([`f02dbc0`](https://github.com/docling-project/docling-serve/commit/f02dbc01449fe1caf3fb4a73c0a5f4adf8265faf))
+
+### Documentation
+
+* Fix parameter in api key docs ([#323](https://github.com/docling-project/docling-serve/issues/323)) ([`37fe022`](https://github.com/docling-project/docling-serve/commit/37fe02277b3e2358eced28e15b4360e7c82d3b43))
+
 ## [v1.3.0](https://github.com/docling-project/docling-serve/releases/tag/v1.3.0) - 2025-08-14
 
 ### Feature

docs/configuration.md

@@ -52,7 +52,7 @@ THe following table describes the options to configure the Docling Serve app.
 |  | `DOCLING_SERVE_CORS_ORIGINS` | `["*"]` | A list of origins that should be permitted to make cross-origin requests. |
 |  | `DOCLING_SERVE_CORS_METHODS` | `["*"]` | A list of HTTP methods that should be allowed for cross-origin requests. |
 |  | `DOCLING_SERVE_CORS_HEADERS` | `["*"]` | A list of HTTP request headers that should be supported for cross-origin requests. |
-|  | `DOCLING_SERVE_ENG_API_KEY` | | If specified, all the API requests must contain the header `X-Api-Key` with this value. |
+|  | `DOCLING_SERVE_API_KEY` | | If specified, all the API requests must contain the header `X-Api-Key` with this value. |
 |  | `DOCLING_SERVE_ENG_KIND` | `local` | The compute engine to use for the async tasks. Possible values are `local`, `rq` and `kfp`. See below for more configurations of the engines. |
 
 ### Compute engine

docs/usage.md

@@ -32,7 +32,7 @@ On top of the source of file (see below), both endpoints support the same parame
 
 ### Authentication
 
-When authentication is activated (see the parameter `DOCLING_SERVE_ENG_API_KEY` in [configuration.md](./configuration.md)), all the API requests **must** provide the header `X-Api-Key` with the correct secret key.
+When authentication is activated (see the parameter `DOCLING_SERVE_API_KEY` in [configuration.md](./configuration.md)), all the API requests **must** provide the header `X-Api-Key` with the correct secret key.
 
 ## Convert endpoints
 

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "docling-serve"
-version = "1.3.0"  # DO NOT EDIT, updated automatically
+version = "1.3.1"  # DO NOT EDIT, updated automatically
 description = "Running Docling as a service"
 license = {text = "MIT"}
 authors = [