chore: Fix docker warning

Dockerfile

@@ -40,7 +40,7 @@ RUN python -m build /src
 #
 
 # Utilities for downloading packages
-FROM ${BASE_IMAGE} as downloader
+FROM ${BASE_IMAGE} AS downloader
 # Bump the date to current to refresh curl/certificates/etc
 RUN echo "2023.07.20"
 RUN apt-get update && \
@@ -53,13 +53,13 @@ RUN apt-get update && \
     apt-get clean && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
 # FreeSurfer 7.3.2
-FROM downloader as freesurfer
+FROM downloader AS freesurfer
 COPY docker/files/freesurfer7.3.2-exclude.txt /usr/local/etc/freesurfer7.3.2-exclude.txt
 RUN curl -sSL https://surfer.nmr.mgh.harvard.edu/pub/dist/freesurfer/7.3.2/freesurfer-linux-ubuntu22_amd64-7.3.2.tar.gz \
      | tar zxv --no-same-owner -C /opt --exclude-from=/usr/local/etc/freesurfer7.3.2-exclude.txt
 
 # AFNI
-FROM downloader as afni
+FROM downloader AS afni
 # Bump the date to current to update AFNI
 RUN echo "2023.07.20"
 RUN mkdir -p /opt/afni-latest \
@@ -80,7 +80,7 @@ RUN mkdir -p /opt/afni-latest \
         -name "3dvolreg" \) -delete
 
 # Connectome Workbench 1.5.0
-FROM downloader as workbench
+FROM downloader AS workbench
 RUN mkdir /opt/workbench && \
     curl -sSLO https://www.humanconnectome.org/storage/app/media/workbench/workbench-linux64-v1.5.0.zip && \
     unzip workbench-linux64-v1.5.0.zip -d /opt && \
@@ -89,13 +89,13 @@ RUN mkdir /opt/workbench && \
     strip --remove-section=.note.ABI-tag /opt/workbench/libs_linux64/libQt5Core.so.5
 
 # Convert3d 1.4.0
-FROM downloader as c3d
+FROM downloader AS c3d
 RUN mkdir /opt/convert3d && \
     curl -fsSL --retry 5 https://sourceforge.net/projects/c3d/files/c3d/Experimental/c3d-1.4.0-Linux-gcc64.tar.gz/download \
     | tar -xz -C /opt/convert3d --strip-components 1
 
 # Micromamba
-FROM downloader as micromamba
+FROM downloader AS micromamba
 
 # Install a C compiler to build extensions when needed.
 # traits<6.4 wheels are not available for Python 3.11+, but build easily.
@@ -125,7 +125,7 @@ RUN npm install -g svgo@^3.2.0 bids-validator@^1.14.0 && \
 #
 # Main stage
 #
-FROM ${BASE_IMAGE} as fmriprep
+FROM ${BASE_IMAGE} AS fmriprep
 
 # Configure apt
 ENV DEBIAN_FRONTEND="noninteractive" \