[stubsabot] Bump boltons to 26.0.*

Release: https://pypi.org/pypi/boltons/26.0.0
Homepage: https://github.com/mahmoud/boltons
Repository: https://github.com/mahmoud/boltons
Typeshed stubs: https://github.com/python/typeshed/tree/main/stubs/boltons
Diff: mahmoud/boltons@25.0.0...26.0.0

Stubsabot analysis of the diff between the two releases:
 - 0 public Python files have been added.
 - 0 files included in typeshed's stubs have been deleted.
 - 9 files included in typeshed's stubs have been modified or renamed.
 - Total lines of Python code added: 455.
 - Total lines of Python code deleted: 43.

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- Leave this PR open (as a reminder, and to prevent stubsabot from opening another PR)
- Fix stubtest failures in another PR, then close this PR

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Author: stubsabot

stubs/boltons/METADATA.toml

@@ -1,2 +1,2 @@
-version = "25.0.*"
+version = "26.0.*"
 upstream-repository = "https://github.com/mahmoud/boltons"