chore(deps): update dependency google/yamlfmt to v0.15.0 (#91)

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

Author: renovate[bot]

Earthfile

@@ -103,7 +103,7 @@ check-shell-formatting:
 yaml-formatting-base:
     FROM +golang-base
     # renovate: datasource=github-releases depName=google/yamlfmt
-    ENV YAMLFMT_VERSION="v0.14.0"
+    ENV YAMLFMT_VERSION="v0.15.0"
     RUN go install github.com/google/yamlfmt/cmd/yamlfmt@$YAMLFMT_VERSION
     COPY ".yamlfmt" "./"
     DO +COPY_CI_DATA