chore(deps): update dependency idna to v3.15 [security]

Author: renovate-bot

.kokoro/docs/docker/requirements.txt

@@ -95,9 +95,9 @@ googleapis-common-protos==1.70.0 \
     --hash=sha256:0e1b44e0ea153e6594f9f394fef15193a68aaaea2d843f83e2742717ca753257 \
     --hash=sha256:b8bfcca8c25a2bb253e0e0b0adaf8c00773e5e6af6fd92397576680b807e0fd8
     # via google-api-core
-idna==3.10 \
-    --hash=sha256:12f65c9b470abda6dc35cf8e63cc574b1c52b11df2c86030af0ac09b01b13ea9 \
-    --hash=sha256:946d195a0d259cbba61165e88e65941f16e9b36ea6ddb97f00452bae8b1287d3
+idna==3.15 \
+    --hash=sha256:048adeaf8c2d788c40fee287673ccaa74c24ffd8dcf09ffa555a2fbb59f10ac8 \
+    --hash=sha256:ca962446ea538f7092a95e057da437618e886f4d349216d2b1e294abfdb65fdc
     # via requests
 proto-plus==1.26.1 \
     --hash=sha256:13285478c2dcf2abb829db158e1047e2f1e8d63a077d94263c2b88b043c75a66 \