Reduce concurrent PR limit in Renovate configuration

[marvinruder]

Signed-off-by: Marvin A. Ruder signed@mruder.dev

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.00% (target: +0.00%)	✅ ∅ (target: 100.00%)

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (d4b719d)	12998	12998	100.00%
Head commit (2f7f1fe)	12998 (+0)	12998 (+0)	100.00% (+0.00%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#1733)	0	0	∅ (not applicable)

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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