Add changesets for #4624 (#4635)

(cherry picked from commit 970a7184ad16ae070eefaf9e9434ce0aba826b3a)

.changeset/dull-ghosts-sip.md

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+---
+'openzeppelin-solidity': patch
+---
+
+`AccessManager`, `AccessManaged`, `GovernorTimelockAccess`: Ensure that calldata shorter than 4 bytes is not padded to 4 bytes.
+pr: #4624

.changeset/purple-squids-attend.md

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+---
+'openzeppelin-solidity': patch
+---
+
+`AccessManager`: Use named return parameters in functions that return multiple values.
+pr: #4624