build(deps): bump dnspython from 2.8.0 to 2.9.0 (#1962)

Bumps [dnspython](https://github.com/rthalley/dnspython) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/rthalley/dnspython/releases)
- [Changelog](https://github.com/rthalley/dnspython/blob/main/doc/whatsnew.rst)
- [Commits](rthalley/dnspython@v2.8.0...v2.9.0)

---
updated-dependencies:
- dependency-name: dnspython
  dependency-version: 2.9.0
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

install/requirements.txt

@@ -7,7 +7,9 @@ annotated-types==0.8.0 \
 certifi==2026.10.19 \
     --hash=sha256:035c1e85572b141bf1c3a3eff0e33a8eb74917522f2559075ff8d2fea780a1ae \
     --hash=sha256:42d35340cc5b9ba78e818ddbff0c5b1c2b779de448a340fd1b989f5fa8670e1b
-    # via requests
+    # via
+    #   -c (workspace)
+    #   requests
 cffi==2.1.1 ; platform_python_implementation != 'PyPy' \
     --hash=sha256:046bfc24911b37851ee1b51aab8bffe713d89c68c6a057b09484ce9fd5f69b4e \
     --hash=sha256:06c72bb76605a4b0cd0aad6930b69d4baf7dd5d806cfc409b824191099700e66 \
@@ -569,7 +571,7 @@ securesystemslib==1.6.0 \
 sigstore==4.5.1 \
     --hash=sha256:02e000197b34980f1d382741d6f83c2fecbcef7debf7304f36a5253f3c892cd9 \
     --hash=sha256:14accda8a7d4ef47cb25b4903829fb10f011048c261a5937724a43d073c4f34d
-    # via -r requirements.in
+    # via -r install/requirements.in
 sigstore-models==0.0.6 \
     --hash=sha256:5201a68f4d7d0f8bec1e2f4378eb646b084c52609a4e31db8c385095fff68b2e \
     --hash=sha256:c766c09470c2a7e8a4a333c893f07e2001c56a3ff1757b1a246119f53169a849