Bump pip from 21.1 to 23.3

Bumps [pip](https://github.com/pypa/pip) from 21.1 to 23.3.
- [Changelog](https://github.com/pypa/pip/blob/main/NEWS.rst)
- [Commits](pypa/pip@21.1...23.3)

---
updated-dependencies:
- dependency-name: pip
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -58,10 +58,6 @@ cython==0.29.23 \
     --hash=sha256:f4aca6bffb1c1c3c4ada3347d0b162a699c18a66e097ee08b63b3a35118fdfcc \
     --hash=sha256:ff885f18d169759b57f116d3956e45cd2b9cba989fde348bba091544c668dc11
     # via -r requirements.in
-importlib-metadata==4.0.1 \
-    --hash=sha256:8c501196e49fb9df5df43833bdb1e4328f64847763ec8a50703148b73784d581 \
-    --hash=sha256:d7eb1dea6d6a6086f8be21784cc9e3bcfa55872b52309bc5fad53a8ea444465d
-    # via pep517
 jinja2==2.11.3 \
     --hash=sha256:03e47ad063331dd6a3f04a43eddca8a966a26ba0c5b7207a9a9e4e08f1b29419 \
     --hash=sha256:a6d58433de0ae800347cab1fa3043cebbabe8baa9d29e668f1c768cb87a333c6
@@ -235,15 +231,7 @@ typing-extensions==3.7.4.3 \
     --hash=sha256:7cb407020f00f7bfc3cb3e7881628838e69d8f3fcab2f64742a5e76b2f841918 \
     --hash=sha256:99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c \
     --hash=sha256:dafc7639cde7f1b6e1acc0f457842a83e722ccca8eef5270af2d74792619a89f
-    # via
-    #   black
-    #   importlib-metadata
-zipp==3.4.1 \
-    --hash=sha256:3607921face881ba3e026887d8150cca609d517579abe052ac81fc5aeffdbd76 \
-    --hash=sha256:51cb66cc54621609dd593d1787f286ee42a5c0adbb4b29abea5a63edc3e03098
-    # via
-    #   importlib-metadata
-    #   pep517
+    # via black
 zstandard==0.15.2 \
     --hash=sha256:1c5ef399f81204fbd9f0df3debf80389fd8aa9660fe1746d37c80b0d45f809e9 \
     --hash=sha256:1faefe33e3d6870a4dce637bcb41f7abb46a1872a595ecc7b034016081c37543 \
@@ -296,7 +284,7 @@ zstandard==0.15.2 \
     # via -r requirements.in
 
 # The following packages are considered to be unsafe in a requirements file:
-pip==21.1 \
-    --hash=sha256:a810bf07c3723a28621c29abe8e34429fa082c337f89aea9a795865416b66d3e \
-    --hash=sha256:ea9f2668484893e90149fd5a6124e04651ffedd67203a8aaf030d31406b937a4
+pip==23.3 \
+    --hash=sha256:bb7d4f69f488432e4e96394612f43ab43dd478d073ef7422604a570f7157561e \
+    --hash=sha256:bc38bb52bc286514f8f7cb3a1ba5ed100b76aaef29b521d48574329331c5ae7b
     # via pip-tools