docs: update persistent

Add version 6.8

Signed-off-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

docs/packages/persistent.yaml

@@ -3,17 +3,17 @@ source-code: https://github.com/zopefoundation/persistent
 license: ZPL-2.1
 versions:
 - version: '6.8'
-  tag: persistent-v6.8-20260907100405
+  tag: persistent-v6.8-20260908083326
   files:
   - filename: persistent-6.8-cp312-cp312-manylinux_2_31_riscv64.manylinux_2_39_riscv64.whl
-    sha256: e53f0e7308dced44d4aa1b0fb5dba584cc1c04a5a90eda10a871c169355f0a4d
+    sha256: bd57db6c31b9f690607dd3bae8b515a070d713c197e90d2327af64fd44bccfb4
     requires-python: '>=3.10'
   - filename: persistent-6.8-cp313-cp313-manylinux_2_31_riscv64.manylinux_2_39_riscv64.whl
-    sha256: b3a1840b22618d378a02b5bd6e3da981f7a198318f9394e0d04cbf7522ef45ce
+    sha256: 525bfa7fc3b528ff7947e365f4daa8ba79d56cc1d4d5bb884202332a30b005de
     requires-python: '>=3.10'
   - filename: persistent-6.8-cp314-cp314-manylinux_2_31_riscv64.manylinux_2_39_riscv64.whl
-    sha256: 539eb3e3b72a7e345d3c15a2bf96118564e870b750a15582f767f67aa908bb39
+    sha256: f162954245c772af5a57c680ca7f58e59aaae8cd036a0bd10ba01ca1388083d2
     requires-python: '>=3.10'
   - filename: persistent-6.8-cp314-cp314t-manylinux_2_31_riscv64.manylinux_2_39_riscv64.whl
-    sha256: 2f17110f128eb6e928851fd69df18bfe2bcba143c1a173964e40e12be1e901a0
+    sha256: da94c4f20a23affaa8921d952240d86bd61a001a22943ed19b87cbea7f68cb19
     requires-python: '>=3.10'