Update dependency pip to v21.2.4

hardening_manifest.yaml

@@ -39,11 +39,11 @@ labels:
 resources:
   - url: "docker://gcr.io/spark-operator/spark-py@sha256:c1f21b8b6f4f0ad7b25177ad086b7eaf7d96747940b0fe2e8dc6ca688c85db76"
     tag: "spark-operator/spark-py:2.4.5"
-  - filename: pip-21.1.1-py3-none-any.whl
-    url: https://files.pythonhosted.org/packages/cd/6f/43037c7bcc8bd8ba7c9074256b1a11596daa15555808ec748048c1507f08/pip-21.1.1-py3-none-any.whl
+  - filename: pip-21.2.4-py3-none-any.whl
+    url: https://files.pythonhosted.org/packages/ca/31/b88ef447d595963c01060998cb329251648acf4a067721b0452c45527eb8/pip-21.2.4-py3-none-any.whl
     validation:
       type: sha256
-      value: 11d095ed5c15265fc5c15cc40a45188675c239fb0f9913b673a33e54ff7d45f0
+      value: fa9ebb85d3fd607617c0c44aca302b1b45d87f9c2a1649b46c26167ca4296323
   - filename: setuptools-53.0.0-py3-none-any.whl
     url: https://files.pythonhosted.org/packages/15/0e/255e3d57965f318973e417d5b7034223f1223de500d91b945ddfaef42a37/setuptools-53.0.0-py3-none-any.whl
     validation: