Update kanister tools docker file to remove installation of awscli, p…

…ip and python (#5116)

* Update tools dockerfile to remove awscli install

* upgrade Restic version

docker/tools/Dockerfile

@@ -1,7 +1,7 @@
 FROM busybox:glibc as restbox
 
 # Get restic executable
-ENV RESTIC_VERSION=0.9.1
+ENV RESTIC_VERSION=0.9.4
 ADD https://github.com/restic/restic/releases/download/v${RESTIC_VERSION}/restic_${RESTIC_VERSION}_linux_amd64.bz2 /
 RUN bzip2 -d restic_${RESTIC_VERSION}_linux_amd64.bz2 && mv restic_${RESTIC_VERSION}_linux_amd64 /bin/restic && chmod +x /bin/restic
 
@@ -10,10 +10,7 @@ MAINTAINER Tom Manville <tom@kasten.io>
 
 COPY --from=restbox /bin/restic /bin/restic
 
-RUN apk -v --update add --no-cache bash curl python py-pip groff less mailcap ca-certificates && \
-    pip install --upgrade pip && \
-    pip install --upgrade awscli && \
-    apk -v --purge del py-pip && \
+RUN apk -v --update add --no-cache bash curl groff less mailcap ca-certificates && \
     rm -f /var/cache/apk/*
 
 RUN curl https://raw.githubusercontent.com/kanisterio/kanister/master/scripts/get.sh | bash