bump-formula-pr: even more precise tag replacement

[bayandin]

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If in a formula tag matches version, then bump-formula-pr with --version argument fails:

% brew bump-formula-pr --version 2022-07-22  --debug exploitdb              
...
==> replace /2022-07-12(?=")/ with "2022-07-22"
==> replace "d84f857e94f91c71fcb93041483f661d29023c1e" with "46346f8944f5d01e09a8ed3d78e34cf759697b47"
==> replace "version \"2022-07-12\"" with "version \"2022-07-22\""
Error: inreplace failed
/opt/homebrew/Library/Taps/homebrew/homebrew-core/Formula/exploitdb.rb:
  expected replacement of "version \"2022-07-12\"" with "version \"2022-07-22\""
/opt/homebrew/Library/Homebrew/utils/inreplace.rb:89:in `inreplace_pairs'
/opt/homebrew/Library/Homebrew/dev-cmd/bump-formula-pr.rb:311:in `bump_formula_pr'
/opt/homebrew/Library/Homebrew/brew.rb:93:in `<main>'

Version got replaced by the first replacement pair (for the tag), and it failed to be replaced on the third one (for version).

Closes #13596

[BrewTestBot]

Review period will end on 2022-07-25 at 13:28:24 UTC.

[BrewTestBot]

Review period ended.