build(deps): [autoapprove] bump pygments from 2.13.0 to 2.15.0 (#359)

Source-Link: https://togithub.com/googleapis/synthtool/commit/eaef28efd179e6eeb9f4e9bf697530d074a6f3b9
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:f8ca7655fa8a449cadcabcbce4054f593dcbae7aeeab34aa3fcc8b5cf7a93c9e

Author: gcf-owl-bot[bot]

.github/.OwlBot.lock.yaml

@@ -13,5 +13,5 @@
 # limitations under the License.
 docker:
   image: gcr.io/cloud-devrel-public-resources/owlbot-python:latest
-  digest: sha256:39f0f3f2be02ef036e297e376fe3b6256775576da8a6ccb1d5eeb80f4c8bf8fb
-# created: 2023-07-17T15:20:13.819193964Z
+  digest: sha256:f8ca7655fa8a449cadcabcbce4054f593dcbae7aeeab34aa3fcc8b5cf7a93c9e
+# created: 2023-07-21T02:12:46.49799314Z

.kokoro/requirements.txt

@@ -396,9 +396,9 @@ pycparser==2.21 \
     --hash=sha256:8ee45429555515e1f6b185e78100aea234072576aa43ab53aefcae078162fca9 \
     --hash=sha256:e644fdec12f7872f86c58ff790da456218b10f863970249516d60a5eaca77206
     # via cffi
-pygments==2.13.0 \
-    --hash=sha256:56a8508ae95f98e2b9bdf93a6be5ae3f7d8af858b43e02c5a2ff083726be40c1 \
-    --hash=sha256:f643f331ab57ba3c9d89212ee4a2dabc6e94f117cf4eefde99a0574720d14c42
+pygments==2.15.0 \
+    --hash=sha256:77a3299119af881904cd5ecd1ac6a66214b6e9bed1f2db16993b54adede64094 \
+    --hash=sha256:f7e36cffc4c517fbc252861b9a6e4644ca0e5abadf9a113c72d1358ad09b9500
     # via
     #   readme-renderer
     #   rich