Update version of OpenSuSE 15.5 (#109)

# Description

Updated the source image version to 15.5 which will speed up build

## Type of Change
_fix_

## Check List

- [X] New functionality includes tests
- [X] All tests pass
- [-] Commit message includes a [Conventional Commit
Message](https://www.conventionalcommits.org/en/v1.0.0)

Signed-off-by: Strahil Nikolov <hunter86_bg@yahoo.com>

opensuse-leap-15.5/Dockerfile

@@ -1,12 +1,12 @@
-FROM opensuse/leap:15.4
+FROM opensuse/leap:15.5
 LABEL maintainer="sean@sean.io"
 ARG BUILD_DATE
 ARG VCS_REF
 
 LABEL org.label-schema.schema-version="1.0"
 LABEL org.label-schema.build-date=$BUILD_DATE
 LABEL org.label-schema.name="test-kitchen/dokken-images"
-LABEL org.label-schema.description="A Docker container for testing opensuse-leap-15.4"
+LABEL org.label-schema.description="A Docker container for testing opensuse-leap-15.5"
 LABEL org.label-schema.vcs-url="https://github.com/test-kitchen/dokken-images"
 LABEL org.label-schema.vcs-ref=$VCS_REF
 LABEL org.label-schema.vendor="test-kitchen"