Update limboria ircbot to bullseye

Spring cleaning updates of our docker images now that bullseye is out.

Change-Id: I5e4b84edd2c5a8e196659e4815c5b349c0226393

docker/ircbot/Dockerfile

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-FROM opendevorg/python-builder:3.9 as builder
+FROM opendevorg/python-builder:3.9-bullseye as builder
 ARG ZUUL_SIBLINGS=""
 
 RUN apt-get update \
@@ -29,7 +29,7 @@ COPY . /tmp/src
 
 RUN assemble
 
-FROM opendevorg/python-base:3.9 as ircbot
+FROM opendevorg/python-base:3.9-bullseye as ircbot
 
 COPY --from=builder /output /output
 

zuul.d/docker-images/ircbot.yaml

@@ -4,8 +4,8 @@
     description: Build a ircbot image.
     parent: system-config-build-image
     requires: &ircbot_requires
-      - python-base-3.9-buster-container-image
-      - python-builder-3.9-buster-container-image
+      - python-base-3.9-bullseye-container-image
+      - python-builder-3.9-bullseye-container-image
     provides: ircbot-container-image
     required-projects: &ircbot_required_projects
       - opendev/meetbot

zuul.d/project.yaml

@@ -138,7 +138,7 @@
         - system-config-build-image-ircbot:
             dependencies:
               - name: opendev-buildset-registry
-              - name: system-config-build-image-python-builder-3.9-buster
+              - name: system-config-build-image-python-builder-3.9-bullseye
                 soft: true
         - system-config-build-image-matrix-eavesdrop:
             dependencies:
@@ -288,7 +288,7 @@
         - system-config-upload-image-ircbot:
             dependencies:
               - name: opendev-buildset-registry
-              - name: system-config-upload-image-python-builder-3.9-buster
+              - name: system-config-upload-image-python-builder-3.9-bullseye
                 soft: true
         - system-config-upload-image-matrix-eavesdrop:
             dependencies: