build(deps): bump idna from 3.4 to 3.7 in /.kokoro

Bumps [idna](https://github.com/kjd/idna) from 3.4 to 3.7.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.4...v3.7)

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

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

.kokoro/requirements.in

@@ -30,4 +30,4 @@ rsa==4.9
 six==1.16.0
 attrs==22.1.0
 google-auth==2.11.0
-idna==3.4
+idna==3.7

.kokoro/requirements.txt

@@ -229,9 +229,9 @@ googleapis-common-protos==1.56.3 \
     # via
     #   -r requirements.in
     #   google-api-core
-idna==3.4 \
-    --hash=sha256:814f528e8dead7d329833b91c5faa87d60bf71824cd12a7530b5526063d02cb4 \
-    --hash=sha256:90b77e79eaa3eba6de819a0c442c0b4ceefc341a7a2ab77d7562bf49f425c5c2
+idna==3.7 \
+    --hash=sha256:028ff3aadf0609c1fd278d8ea3089299412a7a8b9bd005dd08b9f8285bcb5cfc \
+    --hash=sha256:82fee1fc78add43492d3a1898bfa6d8a904cc97d8427f683ed8e798d07761aa0
     # via
     #   -r requirements.in
     #   requests