dockerfile: bump to v2.2.0

Signed-off-by: Patrick Stephens <[email protected]>

dockerfiles/Dockerfile

@@ -11,7 +11,7 @@
 # docker buildx build --platform "linux/amd64,linux/arm64,linux/arm/v7,linux/s390x" -f ./dockerfiles/Dockerfile.multiarch --build-arg FLB_TARBALL=https://github.com/fluent/fluent-bit/archive/v1.8.11.tar.gz ./dockerfiles/
 
 # Set this to the current release version: it gets done so as part of the release.
-ARG RELEASE_VERSION=2.2.1
+ARG RELEASE_VERSION=2.2.0
 
 # For multi-arch builds - assumption is running on an AMD64 host
 FROM multiarch/qemu-user-static:x86_64-arm as qemu-arm32