gemspec: Exclude *.bundle (follow-up #281) (#285) #113

Job	Run time
macos-11 - truffleruby+graalvm-head	5m 56s
macos-12 - truffleruby+graalvm-head	6h 0m 13s
ubuntu-20.04 - truffleruby+graalvm-head	3m 57s
linux-amd64 - ruby-3.0 - gnu	37s
linux-amd64 - ruby-3.0 - musl	40s
linux-arm64 - ruby-3.0 - gnu	4m 35s
linux-arm64 - ruby-3.0 - musl	3m 13s
linux-amd64 - ruby-3.1 - gnu	41s
linux-amd64 - ruby-3.1 - musl	34s
linux-arm64 - ruby-3.1 - gnu	3m 6s
linux-arm64 - ruby-3.1 - musl	4m 29s
linux-amd64 - ruby-3.2 - gnu	38s
linux-amd64 - ruby-3.2 - musl	26s
linux-arm64 - ruby-3.2 - gnu	11m 4s
linux-arm64 - ruby-3.2 - musl	13m 51s
macos-11 - ruby-3.0	42s
macos-11 - ruby-3.1	45s
macos-11 - ruby-3.2	43s
macos-12 - ruby-3.0	48s
macos-12 - ruby-3.1	44s
macos-12 - ruby-3.2	47s
	6h 58m 29s

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