[Chapel Merge] Switch quotes searched for in version update script

Branch: refs/heads/main
Revision: f2123c56eb4a6951357e3b23116d5c4ea1042b49
Author: arifthpe
Link: Switch quotes searched for in version update script by arifthpe · Pull Request #28495 · chapel-lang/chapel · GitHub
Log Message:
Switch quotes searched for in version update script (#28495)

Switch from expecting single quotes to expecting double quotes in
version strings searched for by
util/config/update-release-and-version-info.

This is a consequence of the formatting pass run in
Expand python format CI check to all code but third-party by arifthpe · Pull Request #28437 · chapel-lang/chapel · GitHub. This only affected
Python files, and the only Python file the version script touches is
doc/rst/conf.py, so that is the only one needing adjustment to its
handling. I caught this when manually checking
Set 2.8 to release mode by arifthpe · Pull Request #28494 · chapel-lang/chapel · GitHub.

[trivial, not reviewed]

Testing:

Compare: Comparing c43b81071b4fe7e720b7e24de3a13ed48bf87c48...590c6226328856568be0cfdb7f8f65d7c2097049 · chapel-lang/chapel · GitHub

Diff:
M util/config/update-release-and-version-info
https://github.com/chapel-lang/chapel/pull/28495.diff