Update summon to v0.9.5

[gl-johnson]

Desired Outcome

Update Summon to v0.9.5 to address golang.org/x/net and golang.org/x/text vulnerabilities.

Implemented Changes

Update Summon in go.mod.

Definition of Done

At least 1 todo must be completed in the sections below for the PR to be
merged.

Changelog

• The CHANGELOG has been updated, or
• This PR does not include user-facing changes and doesn't require a
  CHANGELOG update

Test coverage

• This PR includes new unit and integration tests to go with the code
  changes, or
• The changes in this PR do not require tests

Documentation

• Docs (e.g. READMEs) were updated in this PR
• A follow-up issue to update official docs has been filed here: insert issue ID
• This PR does not require updating any documentation

Behavior

• This PR changes product behavior and has been reviewed by a PO, or
• These changes are part of a larger initiative that will be reviewed later, or
• No behavior was changed with this PR

Security

• Security architect has reviewed the changes in this PR,
• These changes are part of a larger initiative with a separate security review, or
• There are no security aspects to these changes

[andytinkham]

@gl-johnson this is looking good. Could you also update the NOTICES.txt file, please? Looks like that has the summon version in it as well. I didn't check the other libraries you bumped here, too, so there might be more changes in that file, too.

[andytinkham]

Thanks, @gl-johnson!