fix: Keep only one pip version per stack

cflinuxfs5 uses pip 26.0.1 (latest)
cflinuxfs3/cflinuxfs4 use pip 25.2 (as before)

Author: ivanovac

manifest.yml

@@ -72,7 +72,6 @@ dependencies:
   uri: https://buildpacks.cloudfoundry.org/dependencies/pip/pip_25.2_linux_noarch_any-stack_7dc1e988.tgz
   sha256: 7dc1e9882eb18f53150261c3a0cde7d5a39cdb18843c930ee01db8582f6b4f27
   cf_stacks:
-  - cflinuxfs5
   - cflinuxfs4
   - cflinuxfs3
   source: https://files.pythonhosted.org/packages/20/16/650289cd3f43d5a2fadfd98c68bd1e1e7f2550a1a5326768cddfbcedb2c5/pip-25.2.tar.gz
@@ -83,8 +82,6 @@ dependencies:
   sha256: 0750a38b65c6038a0415a4ff15ef2df61fcaa6c1e5ec9d8c6678222dbac91306
   cf_stacks:
   - cflinuxfs5
-  - cflinuxfs4
-  - cflinuxfs3
   source: https://files.pythonhosted.org/packages/48/83/0d7d4e9efe3344b8e2fe25d93be44f64b65364d3c8d7bc6dc90198d5422e/pip-26.0.1.tar.gz
   source_sha256: c4037d8a277c89b320abe636d59f91e6d0922d08a05b60e85e53b296613346d8
 - name: pipenv