chore(deps): update gotenberg/gotenberg docker tag to v8.18.0 (#2215)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

kubernetes/tools/paperless-ngx/gotenberg.values.yaml

@@ -1,6 +1,6 @@
 image:
   repository: "gotenberg/gotenberg"
-  tag: "8.17.3@sha256:779d4cf9bb36cb645e26e03fdb1b929b5d0fd01bfa58c336da5e224dd154626e"
+  tag: "8.18.0@sha256:f4c19ea0ce65e7b7ec0ece865dbfc61e8be864cc54b2aba17501883ec78c92aa"
 
 ports:
 - name: main