Upgrade PubGrub (#349)

Upgrades to `fe309ffb63b2f3ce9b35eb7746b2350cd704515e`, with our changes
layered on top.

crates/puffin-cli/tests/snapshots/pip_sync__install_url.snap.new

@@ -1,23 +0,0 @@
----
-source: crates/puffin-cli/tests/pip_sync.rs
-assertion_line: 554
-info:
-  program: puffin
-  args:
-    - pip-sync
-    - requirements.txt
-    - "--cache-dir"
-    - /var/folders/nt/6gf2v7_s3k13zq_t3944rwz40000gn/T/.tmpZjdQsr
-  env:
-    VIRTUAL_ENV: /var/folders/nt/6gf2v7_s3k13zq_t3944rwz40000gn/T/.tmpkhiPUZ/.venv
----
-success: false
-exit_code: 2
------ stdout -----
-
------ stderr -----
-Resolved 1 package in [TIME]
-Downloaded 1 package in [TIME]
-error: Failed to download and unpack wheels
-  Caused by: No such file or directory (os error 2)
-