chore: increase bundle size limit

[vigneshshanmugam]

• fix Bundle size exceeded [CI error] #1030

[apmmachine]

📦 Bundlesize report

Filename	Size(bundled)	Size(gzip)	Diff(gzip)
elastic-apm-opentracing.umd.min.js	63.5 KiB	20.3 KiB	💚 0 Bytes
elastic-apm-rum.umd.min.js	57.6 KiB	18.8 KiB	💚 0 Bytes

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Pull request #1034 opened

• Start Time: 2021-06-08T14:49:22.427+0000

• Duration: 70 min 49 sec

• Commit: 4d1a725

Test stats 🧪

Test	Results
Failed	0
Passed	1058
Skipped	13
Total	1071

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