build(deps): Bump django from 3.2.25 to 4.2.16 in /.kokoro

Bumps [django](https://github.com/django/django) from 3.2.25 to 4.2.16.
- [Commits](django/django@3.2.25...4.2.16)

---
updated-dependencies:
- dependency-name: django
  dependency-type: direct:production
...

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

.kokoro/requirements.in

@@ -1,7 +1,7 @@
 # Library specific extra installations.
 # Extra installations are required to ensure all documentation can be
 # generated and not missed out with the generate-docs script.
-django==3.2.25
+django==4.2.16
 google-cloud-aiplatform[prediction]
 googleapis-common-protos==1.58.0 # pinned for conflict in range specifier.
 grpcio-status==1.48.2 # must be pinned due to protobuf compatibility.

.kokoro/requirements.txt

@@ -171,9 +171,9 @@ distlib==0.3.6 \
     --hash=sha256:14bad2d9b04d3a36127ac97f30b12a19268f211063d8f8ee4f47108896e11b46 \
     --hash=sha256:f35c4b692542ca110de7ef0bea44d73981caeb34ca0b9b6b2e6d7790dda8f80e
     # via virtualenv
-django==3.2.25 \
-    --hash=sha256:7ca38a78654aee72378594d63e51636c04b8e28574f5505dff630895b5472777 \
-    --hash=sha256:a52ea7fcf280b16f7b739cec38fa6d3f8953a5456986944c3ca97e79882b4e38
+django==4.2.16 \
+    --hash=sha256:1ddc333a16fc139fd253035a1606bb24261951bbc3a6ca256717fa06cc41a898 \
+    --hash=sha256:6f1616c2786c408ce86ab7e10f792b8f15742f7b7b7460243929cb371e7f1dad
     # via -r requirements.in
 docker==6.0.0 \
     --hash=sha256:19e330470af40167d293b0352578c1fa22d74b34d3edf5d4ff90ebc203bbb2f1 \
@@ -677,10 +677,6 @@ python-dotenv==0.21.0 \
     --hash=sha256:1684eb44636dd462b66c3ee016599815514527ad99965de77f43e0944634a7e5 \
     --hash=sha256:b77d08274639e3d34145dfa6c7008e66df0f04b7be7a75fd0d5292c191d79045
     # via uvicorn
-pytz==2022.2.1 \
-    --hash=sha256:220f481bdafa09c3955dfbdddb7b57780e9a94f5127e35456a48589b9e0c0197 \
-    --hash=sha256:cea221417204f2d1a2aa03ddae3e867921971d0d76f14d87abb4414415bbdcf5
-    # via django
 pyyaml==6.0 \
     --hash=sha256:01b45c0191e6d66c470b6cf1b9531a771a83c1c4208272ead47a3ae4f2f603bf \
     --hash=sha256:0283c35a6a9fbf047493e3a0ce8d79ef5030852c51e9d911a27badfde0605293 \