Fix docker for numpy again

I forgot about the trouble using '<' in pip dependencies on the CLI.
This time I verified the build works.

PiperOrigin-RevId: 318332763
Change-Id: I347aee8121464232222e72d89409c600159ee80c

tensorflow/tools/dockerfiles/dockerfiles/devel-cpu-jupyter.Dockerfile

@@ -84,7 +84,7 @@ RUN python3 -m pip --no-cache-dir install \
     keras_preprocessing \
     matplotlib \
     mock \
-    numpy<1.19.0 \
+    'numpy<1.19.0' \
     scipy \
     sklearn \
     pandas \

tensorflow/tools/dockerfiles/dockerfiles/devel-cpu.Dockerfile

@@ -84,7 +84,7 @@ RUN python3 -m pip --no-cache-dir install \
     keras_preprocessing \
     matplotlib \
     mock \
-    numpy<1.19.0 \
+    'numpy<1.19.0' \
     scipy \
     sklearn \
     pandas \

tensorflow/tools/dockerfiles/dockerfiles/devel-gpu-jupyter.Dockerfile

@@ -126,7 +126,7 @@ RUN python3 -m pip --no-cache-dir install \
     keras_preprocessing \
     matplotlib \
     mock \
-    numpy<1.19.0 \
+    'numpy<1.19.0' \
     scipy \
     sklearn \
     pandas \

tensorflow/tools/dockerfiles/dockerfiles/devel-gpu.Dockerfile

@@ -126,7 +126,7 @@ RUN python3 -m pip --no-cache-dir install \
     keras_preprocessing \
     matplotlib \
     mock \
-    numpy<1.19.0 \
+    'numpy<1.19.0' \
     scipy \
     sklearn \
     pandas \

tensorflow/tools/dockerfiles/dockerfiles/mkl_horovod/devel-horovod-jupyter.Dockerfile

@@ -84,7 +84,7 @@ RUN python3 -m pip --no-cache-dir install \
     keras_preprocessing \
     matplotlib \
     mock \
-    numpy<1.19.0 \
+    'numpy<1.19.0' \
     scipy \
     sklearn \
     pandas \

tensorflow/tools/dockerfiles/dockerfiles/mkl_horovod/devel-horovod.Dockerfile

@@ -84,7 +84,7 @@ RUN python3 -m pip --no-cache-dir install \
     keras_preprocessing \
     matplotlib \
     mock \
-    numpy<1.19.0 \
+    'numpy<1.19.0' \
     scipy \
     sklearn \
     pandas \

tensorflow/tools/dockerfiles/dockerfiles/ppc64le/devel-cpu-ppc64le-jupyter.Dockerfile

@@ -83,7 +83,7 @@ RUN python3 -m pip --no-cache-dir install \
     keras_preprocessing \
     matplotlib \
     mock \
-    numpy<1.19.0 \
+    'numpy<1.19.0' \
     scipy \
     sklearn \
     pandas \

tensorflow/tools/dockerfiles/dockerfiles/ppc64le/devel-cpu-ppc64le.Dockerfile

@@ -83,7 +83,7 @@ RUN python3 -m pip --no-cache-dir install \
     keras_preprocessing \
     matplotlib \
     mock \
-    numpy<1.19.0 \
+    'numpy<1.19.0' \
     scipy \
     sklearn \
     pandas \

tensorflow/tools/dockerfiles/dockerfiles/ppc64le/devel-gpu-ppc64le-jupyter.Dockerfile

@@ -125,7 +125,7 @@ RUN python3 -m pip --no-cache-dir install \
     keras_preprocessing \
     matplotlib \
     mock \
-    numpy<1.19.0 \
+    'numpy<1.19.0' \
     scipy \
     sklearn \
     pandas \

tensorflow/tools/dockerfiles/dockerfiles/ppc64le/devel-gpu-ppc64le.Dockerfile

@@ -125,7 +125,7 @@ RUN python3 -m pip --no-cache-dir install \
     keras_preprocessing \
     matplotlib \
     mock \
-    numpy<1.19.0 \
+    'numpy<1.19.0' \
     scipy \
     sklearn \
     pandas \

tensorflow/tools/dockerfiles/partials/ubuntu/bazel.partial.Dockerfile

@@ -14,7 +14,7 @@ RUN python3 -m pip --no-cache-dir install \
     keras_preprocessing \
     matplotlib \
     mock \
-    numpy<1.19.0 \
+    'numpy<1.19.0' \
     scipy \
     sklearn \
     pandas \

tensorflow/tools/dockerfiles/partials/ubuntu/bazelbuild.partial.Dockerfile

@@ -13,7 +13,7 @@ RUN python3 -m pip --no-cache-dir install \
     keras_preprocessing \
     matplotlib \
     mock \
-    numpy<1.19.0 \
+    'numpy<1.19.0' \
     scipy \
     sklearn \
     pandas \