Updated libs; Bump to alpine 3.21

Dockerfile

@@ -1,18 +1,11 @@
-FROM alpine:3.20
+FROM alpine:3.21
 
-ENV HOME=/home/app \
-    APP_HOME=/home/app/docker-files-backup \
-    \
-    # python
-    PYTHONPATH=${PYTHONPATH}:${PWD} \
+ENV APP_HOME=/home/app/docker-files-backup \
     PYTHONUNBUFFERED=1 \
     PYTHONDONTWRITEBYTECODE=1 \
     PIP_BREAK_SYSTEM_PACKAGES=1 \
-    \
-    # pip
     PIP_NO_CACHE_DIR=off \
-    PIP_DISABLE_PIP_VERSION_CHECK=on \
-    PIP_DEFAULT_TIMEOUT=100
+    PIP_DISABLE_PIP_VERSION_CHECK=on
 
 RUN apk --no-cache add zstd python3 py3-pip tini tar