Bump Rollbar Apple SDK to 3.4.0 for Xcode 26.4

[matux]

Description of the change

RollbarNotifier 3.3.3 does not compile on Xcode 26.4. RollbarReachability.m imports the private header netinet6/in6.h, which the new toolchain rejects with "Use of private header from outside its module". Rollbar Apple SDK 3.4.0 removes that import (rollbar-apple#368), so bumping the pin is what unblocks iOS builds for consumers.

3.4.0 changes no public headers, so ios/RollbarReactNative.m needs no edits. It also carries an upstream fix for an integer-overflow crash in crash-report address arithmetic (rollbar-apple#364).

rollbar-react-native stays at 1.0.1. The release bump is a separate change, matching how #196 and #203 handled prior SDK bumps.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Maintenance
• New release

Related issues

• Fix Bump RollbarNotifier to 3.4.0 needed for xcode 26.4 #221
• Fix rollbar-apple#367

Verification

Verified statically, no build was run locally:

• RollbarNotifier 3.4.0 and its ~> 3.4.0 dependencies (RollbarCommon, RollbarCrash, RollbarReport) are published on CocoaPods trunk.
• The 3.3.3...3.4.0 diff touches no public headers, and RollbarNotifier.podspec is unchanged apart from s.version: same iOS deployment target, swift_versions, and module map.

Reviewer check: in a consuming app, pod install should resolve RollbarNotifier (3.4.0) and xcodebuild should succeed under Xcode 26.4, where 3.3.3 currently fails.

Checklists

Development

• Lint rules pass locally
• The code changed/added as part of this pull request has been covered with tests
• All tests related to the changed code pass in development

Not applicable. The change is a one-line dependency pin in the podspec, with no Objective-C, Java, or JavaScript source touched.

Code review

• This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• "Ready for review" label attached to the PR and reviewers assigned
• Issue from task tracker has a link to this pull request
• Changes have been reviewed by at least one other engineer

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