AVRO-3952: Remove Outdated Pypy Versions

Per [this ml discussion](https://lists.apache.org/thread/ng2l9r587knkzm7xxx3l4gfblzd9k9lw)

.github/workflows/test-lang-py.yml

@@ -46,8 +46,6 @@ jobs:
         - '3.9'
         - '3.8'
         - '3.7'
-        - 'pypy-3.7'
-        - 'pypy-3.8'
         - 'pypy-3.9'
         - 'pypy-3.10'
 
@@ -94,8 +92,6 @@ jobs:
         - '3.9'
         - '3.8'
         - '3.7'
-        - 'pypy-3.7'
-        - 'pypy-3.8'
         - 'pypy-3.9'
         - 'pypy-3.10'
 

lang/py/tox.ini

@@ -26,8 +26,6 @@ envlist =
     py39
     py310
     py311
-    pypy3.7
-    pypy3.8
     pypy3.9
     pypy3.10
 

share/docker/Dockerfile

@@ -178,7 +178,7 @@ RUN curl -sSL https://cpanmin.us \
  && rm -rf .cpanm
 
 # Install Python3
-ENV PATH="${PATH}:/opt/pypy3.8/bin:/opt/pypy3.9/bin:/opt/pypy3.10/bin" \
+ENV PATH="${PATH}:/opt/pypy3.9/bin:/opt/pypy3.10/bin" \
     PIP_NO_CACHE_DIR=off
 
 # https://docs.docker.com/engine/reference/builder/#automatic-platform-args-in-the-global-scope
@@ -188,12 +188,10 @@ RUN case "${BUILDARCH:?}" in \
       *) pypyarch=linux64;; \
     esac \
  && cd /opt \
- && for url in https://downloads.python.org/pypy/pypy3.8-v7.3.11-"$pypyarch".tar.bz2 \
-               https://downloads.python.org/pypy/pypy3.9-v7.3.12-"$pypyarch".tar.bz2 \
+ && for url in https://downloads.python.org/pypy/pypy3.9-v7.3.12-"$pypyarch".tar.bz2 \
                https://downloads.python.org/pypy/pypy3.10-v7.3.12-"$pypyarch".tar.bz2; \
     do curl -fsSL "$url" | tar -xvjpf -; \
     done \
- && ln -s pypy3.8* pypy3.8 \
  && ln -s pypy3.9* pypy3.9 \
  && ln -s pypy3.10* pypy3.10