🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

.kokoro/requirements.txt

@@ -136,9 +136,9 @@ gcp-docuploader==0.6.3 \
     --hash=sha256:ba8c9d76b3bbac54b0311c503a373b00edc2dc02d6d54ea9507045adb8e870f7 \
     --hash=sha256:c0f5aaa82ce1854a386197e4e359b120ad6d4e57ae2c812fce42219a3288026b
     # via -r requirements.in
-gcp-releasetool==1.8.9 \
-    --hash=sha256:22a2ebdccff65f3b20726dff643c78780ae1de5d6ce4dc92b279fe0bd927f441 \
-    --hash=sha256:4d0c587c4ad9ef9f52845c0b6ad007a29c350ab6f3e8b13d4e02e15c0d773f39
+gcp-releasetool==1.8.7 \
+    --hash=sha256:3d2a67c9db39322194afb3b427e9cb0476ce8f2a04033695f0aeb63979fc2b37 \
+    --hash=sha256:5e4d28f66e90780d77f3ecf1e9155852b0c3b13cbccb08ab07e66b2357c8da8d
     # via -r requirements.in
 google-api-core==2.8.2 \
     --hash=sha256:06f7244c640322b508b125903bb5701bebabce8832f85aba9335ec00b3d02edc \
@@ -231,9 +231,9 @@ idna==3.4 \
     # via
     #   -r requirements.in
     #   requests
-importlib-metadata==5.0.0 \
-    --hash=sha256:da31db32b304314d044d3c12c79bd59e307889b287ad12ff387b3500835fc2ab \
-    --hash=sha256:ddb0e35065e8938f867ed4928d0ae5bf2a53b7773871bfe6bcc7e4fcdc7dea43
+importlib-metadata==4.8.3 \
+    --hash=sha256:65a9576a5b2d58ca44d133c42a241905cc45e34d2c06fd5ba2bafa221e5d7b5e \
+    --hash=sha256:766abffff765960fcc18003801f7044eb6755ffae4521c8e8ce8e83b9c9b0668
     # via
     #   -r requirements.in
     #   keyring