TechDocs - Updated the defaultDockerImage version

Signed-off-by: Andre Wanlin <awanlin@spotify.com>

.changeset/sour-kings-allow.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-techdocs-node': patch
+---
+
+Updated the `defaultDockerImage` to reflect the latest TechDocs Container version of v1.2.8

plugins/techdocs-node/src/stages/generate/techdocs.ts

@@ -53,8 +53,10 @@ export class TechdocsGenerator implements GeneratorBase {
   /**
    * The default docker image (and version) used to generate content. Public
    * and static so that techdocs-node consumers can use the same version.
+   *
+   * See {@link https://hub.docker.com/r/spotify/techdocs/tags} for list of available versions.
    */
-  public static readonly defaultDockerImage = 'spotify/techdocs:v1.2.6';
+  public static readonly defaultDockerImage = 'spotify/techdocs:v1.2.8';
   private readonly logger: LoggerService;
   private readonly containerRunner?: TechDocsContainerRunner;
   private readonly options: GeneratorConfig;