Fix python2.7 paths due to Py2.7 EOL (#723)

* Fix python2.7 paths due to Py2.7 EOL

Dockerfile

@@ -19,7 +19,7 @@ ARG UBUNTU_VERSION
 ARG LIBRARIES
 RUN apt-get update && \
     apt-get install -qqy --no-install-recommends python2.7 zlib1g curl ca-certificates && \
-    curl https://bootstrap.pypa.io/get-pip.py --output get-pip.py && python2.7 get-pip.py && \
+    curl https://bootstrap.pypa.io/2.7/get-pip.py --output get-pip.py && python2.7 get-pip.py && \
     update-alternatives --install /usr/bin/python2 python2 /usr/bin/python2.7 1 && \
     if [ "${UBUNTU_VERSION}" = "18.04" ] ; then \
       apt-get install -qqy --no-install-recommends libtinfo5 ; \
@@ -43,7 +43,7 @@ RUN apt-get update && \
     pip3 install ccsyspath
 
 # needed for 20.04 support until we migrate to py3
-RUN curl https://bootstrap.pypa.io/get-pip.py --output get-pip.py && python2.7 get-pip.py
+RUN curl https://bootstrap.pypa.io/2.7/get-pip.py --output get-pip.py && python2.7 get-pip.py
 RUN update-alternatives --install /usr/bin/python2 python2 /usr/bin/python2.7 1
 
 COPY --from=anvill /opt/trailofbits/remill /opt/trailofbits/remill