build(deps): Bump zipp from 3.8.1 to 3.19.1 in /.kokoro

Bumps [zipp](https://github.com/jaraco/zipp) from 3.8.1 to 3.19.1.
- [Release notes](https://github.com/jaraco/zipp/releases)
- [Changelog](https://github.com/jaraco/zipp/blob/main/NEWS.rst)
- [Commits](jaraco/zipp@v3.8.1...v3.19.1)

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

Signed-off-by: dependabot[bot] <support@github.com>

.kokoro/requirements.txt

@@ -956,9 +956,9 @@ wheel==0.38.4 \
     --hash=sha256:965f5259b566725405b05e7cf774052044b1ed30119b5d586b2703aafe8719ac \
     --hash=sha256:b60533f3f5d530e971d6737ca6d58681ee434818fab630c83a734bb10c083ce8
     # via -r requirements.in
-zipp==3.8.1 \
-    --hash=sha256:05b45f1ee8f807d0cc928485ca40a07cb491cf092ff587c0df9cb1fd154848d2 \
-    --hash=sha256:47c40d7fe183a6f21403a199b3e4192cca5774656965b0a4988ad2f8feb5f009
+zipp==3.19.1 \
+    --hash=sha256:2828e64edb5386ea6a52e7ba7cdb17bb30a73a858f5eb6eb93d8d36f5ea26091 \
+    --hash=sha256:35427f6d5594f4acf82d25541438348c26736fa9b3afa2754bcd63cdb99d8e8f
     # via importlib-metadata
 
 # The following packages are considered to be unsafe in a requirements file: