[harfbuzz] Upgrade pip

Author: behdad

projects/harfbuzz/Dockerfile

@@ -16,6 +16,7 @@
 
 FROM gcr.io/oss-fuzz-base/base-builder
 RUN apt-get update && apt-get install -y python3-pip ragel pkg-config zlib1g-dev:i386 && \
+    pip3 install --upgrade pip && \
     pip3 install meson==1.2.0 ninja
 RUN git clone --depth 1 https://github.com/harfbuzz/harfbuzz.git
 WORKDIR harfbuzz