Widen ranges of fixnum and protobuf

[evanweible-wf]

Fixnum v1 and protobuf v2 are major releases, but only because they include the null-safety migration. This commit raises the maximum for these dependencies to unblock consumption of newer versions by downstream consumers.

This work is a part of CPLAT's dependency upgrade efforts.

[rmconsole-wf]

Merge Requirements Met ✅

Request Rosie to automerge this pull request by including @Workiva/release-management-p in a comment.

General Information

Ticket(s): None found in title
Code Review(s): #35
Release Image Tags:

Reviewers: corwinsheahan-wf, blakeroberts-wk, todbachman-wf, alanknight-wk

Additional Information

Watchlist Notifications: None
Pull Requests included in release:

	When this pull is merged I will add it to the following release:
	Version: opentelemetry-dart 0.1.18
	Release Ticket(s): O11Y-1412

	This pull is considered the release of opentelemetry-dart 0.1.18 
	The options defined for this repo will be carried out

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Last updated on Wednesday, January 12 10:52 AM CST

[aviary-wf]

Security Insights

No security relevant content was detected by automated scans.

Action Items

• Review PR for security impact; comment "security review required" if needed or unsure
• Verify aviary.yaml coverage of security relevant code

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[blakeroberts-wk]

@Workiva/product-new-relic

[blakeroberts-wk]

@Workiva/release-management-p

[rmconsole-wf]

+1 from RM